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Lanthanum
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Lanthanum, 57La
General properties
Pronunciation
/ˈlænθənəm/
Appearance
silvery white
Standard atomic weight (Ar)
7002138905470000000♠138.90547(7)[1]
Lanthanum in the periodic table
Y
↑
La
↓
Ac
barium ← lanthanum → cerium
Atomic number (Z)
57
Group, period
group 3, period 6
Block
d-block
Element category
lanthanide, sometimes considered a transition metal
Electron configuration
[Xe] 5d1 6s2
Electrons per shell
2, 8, 18, 18, 9, 2
Physical properties
Spectral lines

Phase (at STP)
solid
Melting point
1193 K (920 °C, 1688 °F)
Boiling point
3737 K (3464 °C, 6267 °F)
Density (near r.t.)
6.162 g/cm3
when liquid (at m.p.)
5.94 g/cm3
Heat of fusion
6.20 kJ/mol
Heat of vaporization
400 kJ/mol
Molar heat capacity
27.11 J/(mol·K)
Vapor pressure (extrapolated)
P (Pa)
1
10
100
1 k
10 k
100 k
at T (K)
2005 2208 2458 2772 3178 3726
Atomic properties
Oxidation states
3, 2, 1 (a strongly basic oxide)
Electronegativity
Pauling scale: 1.10
Ionization energies
1st: 538.1 kJ/mol
2nd: 1067 kJ/mol
3rd: 1850.3 kJ/mol
Atomic radius
empirical: 187 pm
Covalent radius
207±8 pm
Miscellanea
Crystal structure
double hexagonal close-packed (dhcp)
Speed of sound thin rod
2475 m/s (at 20 °C)
Thermal expansion
α, poly: 12.1 µm/(m·K) (at r.t.)
Thermal conductivity
13.4 W/(m·K)
Electrical resistivity
α, poly: 615 nΩ·m (at r.t.)
Magnetic ordering
paramagnetic[2]
Magnetic susceptibility
+118.0·10−6 cm3/mol (298 K)[3]
Young's modulus
α form: 36.6 GPa
Shear modulus
α form: 14.3 GPa
Bulk modulus
α form: 27.9 GPa
Poisson ratio
α form: 0.280
Mohs hardness
2.5
Vickers hardness
360–1750 MPa
Brinell hardness
350–400 MPa
CAS Number
7439-91-0
History
Discovery
Carl Gustaf Mosander (1838)
Main isotopes of lanthanum
Isotope
Abundance
Half-life (t1/2)
Decay mode
Product
137La
syn 6×104 y ε 137Ba
138La
0.089% 1.05×1011 y ε 138Ba
β− 138Ce
139La
99.911% stable
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Lanthanum is a chemical element with symbol La and atomic number 57. It is a soft, ductile, silvery-white metal that tarnishes rapidly when exposed to air and is soft enough to be cut with a knife. It is the eponym of the lanthanide series, a group of 15 similar elements between lanthanum and lutetium in the periodic table, of which lanthanum is the first and the prototype. It is also sometimes considered the first element of the 6th-period transition metals and is traditionally counted among the rare earth elements. The usual oxidation state is +3. Lanthanum has no biological role in humans but is essential to some bacteria. It is not particularly toxic to humans but does show some antimicrobial activity.
Lanthanum usually occurs together with cerium and the other rare earth elements. Lanthanum was first found by the Swedish chemist Carl Gustav Mosander in 1839 as an impurity in cerium nitrate – hence the name lanthanum, from the Ancient Greek λανθάνειν (lanthanein), meaning "to lie hidden". Although it is classified as a rare earth element, lanthanum is the 28th most abundant element in the Earth's crust, almost three times as abundant as lead. In minerals such as monazite and bastnäsite, lanthanum composes about a quarter of the lanthanide content.[4] It is extracted from those minerals by a process of such complexity that pure lanthanum metal was not isolated until 1923.
Lanthanum compounds have numerous applications as catalysts, additives in glass, carbon arc lamps for studio lights and projectors, ignition elements in lighters and torches, electron cathodes, scintillators, GTAW electrodes, and other things. Lanthanum carbonate is used as a phosphate binder in cases of renal failure.
Contents
[hide]
1 Characteristics
1.1 Physical
1.2 Chemical
1.3 Isotopes
1.4 Position in the periodic table
2 Compounds
3 History
4 Occurrence and production
5 Applications
6 Biological role
7 Precautions
8 See also
9 Notes
10 References
11 Bibliography
12 Further reading
Characteristics[edit]
Physical[edit]
Lanthanum is the first element and prototype of the lanthanide series.[a] In the periodic table, it appears to the right of the alkaline earth metal barium and to the left of the lanthanide cerium. Lanthanum is often considered to be a group 3 element, along with its lighter congeners scandium and yttrium and its heavier congener, the radioactive actinium,[6] although this classification is sometimes disputed. Similarly to scandium, yttrium, and actinium, the 57 electrons of a lanthanum atom are arranged in the configuration [Xe]5d16s2, with three valence electrons outside the noble gas core. In chemical reactions, lanthanum almost always gives up these three valence electrons from the 5d and 6s subshells to form the +3 oxidation state, achieving the stable configuration of the preceding noble gas xenon.[7] Some lanthanum(II) compounds are also known, but they are much less stable.[8]
Among the lanthanides, lanthanum is exceptional as it does not have any 4f electrons; indeed, the sudden contraction and lowering of energy of the 4f orbital that is important for the chemistry of the lanthanides only begins to happen at cerium. Thus it is only very weakly paramagnetic, unlike the strongly paramagnetic later lanthanides (with the exceptions of the last two, ytterbium and lutetium, where the 4f shell is completely full).[9] Furthermore, since the melting points of the trivalent lanthanides are related to the extent of hybridisation of the 6s, 5d, and 4f electrons, lanthanum has the second-lowest (after cerium) melting point among all the lanthanides: 920 °C.[10] The lanthanides become harder as the series is traversed: as expected, lanthanum is a soft metal. Lanthanum has a relatively high resistivity of 615 nΩm at room temperature; in comparison, the value for the good conductor aluminium is only 26.50 nΩm.[11][12] Lanthanum is the least volatile of the lanthanides.[13] Like most of the lanthanides, lanthanum has a hexagonal crystal structure at room temperature. At 310 °C, lanthanum changes to a face-centered cubic structure, and at 865 °C, it changes to a body-centered cubic structure.[12]
Chemical[edit]
As expected from periodic trends, lanthanum has the largest atomic radius of the lanthanides and the stable group 3 elements. Hence, it is the most reactive among them, tarnishing slowly in air and burning readily to form lanthanum(III) oxide, La2O3, which is almost as basic as calcium oxide.[14] A centimeter-sized sample of lanthanum will corrode completely in a year as its oxide spalls off like iron rust, instead of forming a protective oxide coating like aluminium and lanthanum's lighter congeners scandium and yttrium.[15] Lanthanum reacts with the halogens at room temperature to form the trihalides, and upon warming will form binary compounds with the nonmetals nitrogen, carbon, sulfur, phosphorus, boron, selenium, silicon and arsenic.[7][8] Lanthanum reacts slowly with water to form lanthanum(III) hydroxide, La(OH)3.[16] In dilute sulfuric acid, lanthanum readily forms the aquated tripositive ion [La(H2O)9]3+: this is colorless in aqueous solution since La3+ has no f electrons.[16] Lanthanum is the strongest and hardest base among the lanthanides and group 3 elements, which is again expected from its being the largest of them.[17]
Isotopes[edit]
Main article: Isotopes of lanthanum
Naturally occurring lanthanum is made up of two isotopes, the stable 139La and the primordial long-lived radioisotope 138La. 139La is by far the most abundant, making up 99.910% of natural lanthanum: it is produced in the s-process (slow neutron capture, which occurs in low- to medium-mass stars) and the r-process (rapid neutron capture, which occurs in core-collapse supernovae).[18] The very rare isotope 138La is one of the few primordial odd-odd nuclei, with a long half-life of 1.05×1011 years: it is one of the proton-rich p-nuclei which cannot be produced in the s- or r-processes. 138La, along with the even rarer 180mTa, is produced in the ν-process, where neutrinos interact with stable nuclei.[19] All other lanthanum isotopes are synthetic: with the exception of 137La with a half-life of about 60,000 years, all of them have half-lives less than a day, and most have half-lives less than a minute. The isotopes 139La and 140La occur as fission products of uranium.[18]
Position in the periodic table[edit]
Traditionally, from the 1940s, lanthanum has been placed under scandium and yttrium in group 3 of the periodic table, as its differentiating electron from the previous element goes into a d-orbital. This results in a consistent set of electron configurations in group 3 (Sc: [Ar]3d14s2; Y: [Kr]4d15s2; La: [Xe]5d16s2). However, this position has sometimes been disputed, on the grounds that yttrium and to a lesser extent scandium are closer in their chemical properties to lutetium than lanthanum. Indeed, early techniques on separating the rare earths relied on the distinction between the early lanthanides in the cerium group (whose sodium double sulfates dissolve in water with difficulty) and the late ones (as well as yttrium) in the yttrium group (whose sodium double sulfates are very water-soluble), prompting some researchers in the 1920s and 1930s to place lutetium under yttrium instead. Since the differentiating electron between ytterbium and lutetium also goes into a d-orbital, both lutetium and lanthanum appear by this argument as equally valid candidates for being the third member of group 3.[20]
Many of the discrepancies between lanthanum and the lighter group 3 elements can simply be explained by its larger size, as expected from periodic trends, as it precedes the lanthanide contraction that makes the early period 6 transition metals so similar to their period 5 homologs.[21] This phenomenon, based on the poor shielding of nuclear charge by the 4f electrons that are added across the lanthanide series, results in a decrease of ionic and atomic radii across the lanthanide series, causing the early period 6 transition metals (just after the lanthanides) until about rhenium to be very similar to their period 5 homologs. This same effect makes yttrium more similar to lutetium ([Xe]4f145d16s2) than lanthanum. However, scandium still shows many differences from lutetium because it is even smaller, and in any case the similarity of yttrium is more generally to all of the late lanthanides from gadolinium onward, especially holmium which has almost the same ionic radius.[22] Unlike all the other lanthanides, no lanthanum ions have any electrons in f-orbitals (La+: [Xe]5d2; La2+: [Xe]5d1; La3+: [Xe]),[23]; this casts some doubt on lanthanum's placement in the f-block, as would be suggested by a table placing lutetium in group 3.[24] Although f-orbitals have been suggested to be involved in metallic bonding in lanthanum metal,[25] d-orbital involvement has been found in calcium, which precedes the d-block.[26]
The trends going down from scandium and yttrium to lanthanum tend to be more similar to those going down groups 1 and 2 in the periodic table, while those going down from scandium and yttrium to lutetium tend to be more similar to those in the early transition metals. Since Sc3+, Y3+, and La3+ still have a low enough charge for their compounds to be predominantly ionic, unlike Ti4+, Zr4+, and Hf4+, it has been argued that lanthanum and the rest of group 3 should be considered at best atypical transition metals, as their chemistry is focused on the predominantly ionic +3 state and they have a low ability to form coordination compounds or organometallic compounds. Indeed, lanthanum is a strongly electropositive metal, comparable to calcium in electropositivity.[21] The rare earth metals in general are more similar in reactivity to the alkaline earth metals that immediately precede them than to the transition metals proper which follow them.[22]
Compounds[edit]
Lanthanum oxide is a white solid that can be prepared by direct reaction of its constituent elements. Due to the large size of the La3+ ion, La2O3 adopts a hexagonal 7-coordinate structure that changes to the 6-coordinate structure of scandium oxide (Sc2O3) and yttrium oxide (Y2O3) at high temperature. When it reacts with water, lanthanum hydroxide is formed: a lot of heat is evolved in the reaction and a hissing sound is heard. Lanthanum hydroxide will react with atmospheric carbon dioxide to form the basic carbonate.[21]
Lanthanum fluoride is insoluble in water and can be used as a qualitative test for the presence of La3+. The heavier halides are all very soluble deliquescent compounds. The anhydrous halides are produced by direct reaction of their elements, as heating the hydrates causes hydrolysis: for example, heating hydrated LaCl3 produces LaOCl.[21]
Lanthanum reacts exothermically with hydrogen to produce the dihydride LaH2, a black, pyrophoric, brittle, conducting compound with the calcium fluoride structure.[27] This is a non-stoichiometric compound, and further absorption of hydrogen is possible, with a concomitant loss of electrical conductivity, until the more salt-like LaH3 is reached.[21] Like LaI2 and LaI, LaH2 is probably an electride compound.[21]
Due to the large ionic radius and great electropositivity of La3+, there is not much covalent contribution to its bonding and hence it has a limited coordination chemistry, like yttrium and the other lanthanides.[28] Lanthanum oxalate does not dissolve very much in alkali-metal oxalate solutions, and [La(acac)3(H2O)2] decomposes around 500 °C. Oxygen is the most common donor atom in lanthanum complexes, which are mostly ionic and often have high coordination numbers over 6: 8 is the most characteristic, forming square antiprismatic and dodecadeltahedral structures. These high-coordinate species, reaching up to coordination number 12 with the use of chelating ligands such as in La2(SO4)3·9H2O, often have a low degree of symmetry because of stereo-chemical factors.[28]
Lanthanum chemistry tends not to involve π bonding due to the electron configuration of the element: thus its organometallic chemistry is quite limited. The best characterized organolanthanum compounds are the cyclopentadienyl complex La(C5H5)3, which is produced by reacting anhydrous LaCl3 with NaC5H5 in tetrahydrofuran, and its methyl-substituted derivatives.[29]
History[edit]
Carl Gustaf Mosander, discoverer of lanthanum
In 1751, the Swedish mineralogist Axel Fredrik Cronstedt discovered a heavy mineral from the mine at Bastnäs, later named cerite. Thirty years later, the fifteen-year-old Vilhelm Hisinger, from the family owning the mine, sent a sample of it to Carl Scheele, who did not find any new elements within. In 1803, after Hisinger had become an ironmaster, he returned to the mineral with Jöns Jacob Berzelius and isolated a new oxide which they named ceria after the dwarf planet Ceres, which had been discovered two years earlier.[30] Ceria was simultaneously independently isolated in Germany by Martin Heinrich Klaproth.[31] Between 1839 and 1843, ceria was shown to be a mixture of oxides by the Swedish surgeon and chemist Carl Gustaf Mosander, who lived in the same house as Berzelius: he separated out two other oxides which he named lanthana and didymia.[32] He partially decomposed a sample of cerium nitrate by roasting it in air and then treating the resulting oxide with dilute nitric acid.[33] Since lanthanum's properties differed only slightly from those of cerium, and occurred along with it in its salts, he named it from the Ancient Greek λανθάνειν [lanthanein] (lit. to lie hidden).[31] Relatively pure lanthanum metal was first isolated in 1923.[8]
Occurrence and production[edit]
Lanthanum is the third-most abundant of all the lanthanides, making up 39 mg/kg of the Earth's crust, behind neodymium at 41.5 mg/kg and cerium at 66.5 mg/kg. It is almost three times as abundant as lead in the Earth's crust.[34] Despite being among the so-called "rare earth metals", lanthanum is thus not rare at all, but it is historically so named because it is rarer than "common earths" such as lime and magnesia, and historically only a few deposits were known. Lanthanum is considered a rare earth metal because the process to mine it is difficult, time-consuming and expensive.[8]
The La3+ ion is similarly-sized to the early lanthanides of the cerium group (those up to samarium and europium) that immediately follow in the periodic table, and hence it tends to occur along with them in phosphate, silicate and carbonate minerals, such as monazite (MIIIPO4) and bastnäsite (MIIICO3F), where M refers to all the rare earth metals except scandium and the radioactive promethium (mostly Ce, La, and Y).[35] Bastnäsite is usually lacking in thorium and the heavy lanthanides, and the purification of the light lanthanides from it is less involved. The ore, after being crushed and ground, is first treated with hot concentrated sulfuric acid, evolving carbon dioxide, hydrogen fluoride, and silicon tetrafluoride: the product is then dried and leached with water, leaving the early lanthanide ions, including lanthanum, in solution.[36]
The procedure for monazite, which usually contains all the rare earths as well as thorium, is more involved. Monazite, because of its magnetic properties, can be separated by repeated electromagnetic separation. After separation, it is treated with hot concentrated sulfuric acid to produce water-soluble sulfates of rare earths. The acidic filtrates are partially neutralized with sodium hydroxide to pH 3-4. Thorium precipitates out of solution as hydroxide and is removed. After that, the solution is treated with ammonium oxalate to convert rare earths to their insoluble oxalates. The oxalates are converted to oxides by annealing. The oxides are dissolved in nitric acid that excludes one of the main components, cerium, whose oxide is insoluble in HNO3. Lanthanum is separated as a double salt with ammonium nitrate by crystallization. This salt is relatively less soluble than other rare earth double salts and therefore stays in the residue.[8] Care must be taken when handling some of the residues as they contain 228Ra, the daughter of 232Th, which is a strong gamma emitter.[36] Lanthanum is relatively easy to extract as it has only one neighbouring lanthanide, cerium, which can be removed by making use of its ability to be oxidised to the +4 state; thereafter, lanthanum may be separated out by the historical method of fractional crystallization of La(NO3)3·2NH4NO3·4H2O, or by ion-exchange techniques when higher purity is desired.[36]
Lanthanum metal is obtained from its oxide by heating it with ammonium chloride or fluoride and hydrofluoric acid at 300-400 °C to produce the chloride or fluoride:[8]
La2O3 + 6 NH4Cl → 2 LaCl3 + 6 NH3 + 3 H2O
This is followed by reduction with alkali or alkaline earth metals in vacuum or argon atmosphere:[8]
LaCl3 + 3 Li → La + 3 LiCl
Also, pure lanthanum can be produced by electrolysis of molten mixture of anhydrous LaCl3 and NaCl or KCl at elevated temperatures.[8]
Applications[edit]
A Coleman white gas lantern mantle burning at full brightness
The first historical application of lanthanum was in gas lantern mantles. Carl Auer von Welsbach used a mixture of 60% magnesium oxide, 20% lanthanum oxide, and 20% yttrium oxide, which he called Actinophor and patented in 1885. The original mantles gave a green-tinted light and were not very successful, and his first company, which established a factory in Atzgersdorf in 1887, failed in 1889.[37]
Modern uses of lanthanum include:
LaB
6 hot cathode
Comparison of infrared transmittance of ZBLAN glass and silica
One material used for anodic material of nickel-metal hydride batteries is La(Ni
3.6Mn
0.4Al
0.3Co
0.7). Due to high cost to extract the other lanthanides, a mischmetal with more than 50% of lanthanum is used instead of pure lanthanum. The compound is an intermetallic component of the AB
5 type.[38][39]
As most hybrid cars use nickel-metal hydride batteries, massive quantities of lanthanum are required for the production of hybrid automobiles. A typical hybrid automobile battery for a Toyota Prius requires 10 to 15 kilograms (22 to 33 lb) of lanthanum. As engineers push the technology to increase fuel efficiency, twice that amount of lanthanum could be required per vehicle.[40][41]
Hydrogen sponge alloys can contain lanthanum. These alloys are capable of storing up to 400 times their own volume of hydrogen gas in a reversible adsorption process. Heat energy is released every time they do so; therefore these alloys have possibilities in energy conservation systems.[12][42]
Mischmetal, a pyrophoric alloy used in lighter flints, contains 25% to 45% lanthanum.[43]
Lanthanum oxide and the boride are used in electronic vacuum tubes as hot cathode materials with strong emissivity of electrons. Crystals of LaB
6 are used in high-brightness, extended-life, thermionic electron emission sources for electron microscopes and Hall-effect thrusters.[44]
Lanthanum trifluoride (LaF
3) is an essential component of a heavy fluoride glass named ZBLAN. This glass has superior transmittance in the infrared range and is therefore used for fiber-optical communication systems.[45]
Cerium-doped lanthanum bromide and lanthanum chloride are the recent inorganic scintillators, which have a combination of high light yield, best energy resolution, and fast response. Their high yield converts into superior energy resolution; moreover, the light output is very stable and quite high over a very wide range of temperatures, making it particularly attractive for high-temperature applications. These scintillators are already widely used commercially in detectors of neutrons or gamma rays.[46]
Carbon arc lamps use a mixture of rare earth elements to improve the light quality. This application, especially by the motion picture industry for studio lighting and projection, consumed about 25% of the rare-earth compounds produced until the phase out of carbon arc lamps.[12][47]
Lanthanum(III) oxide (La
2O
3) improves the alkali resistance of glass and is used in making special optical glasses, such as infrared-absorbing glass, as well as camera and telescope lenses, because of the high refractive index and low dispersion of rare-earth glasses.[12] Lanthanum oxide is also used as a grain-growth additive during the liquid-phase sintering of silicon nitride and zirconium diboride.[48]
Small amounts of lanthanum added to steel improves its malleability, resistance to impact, and ductility, whereas addition of lanthanum to molybdenum decreases its hardness and sensitivity to temperature variations.[12]
Small amounts of lanthanum are present in many pool products to remove the phosphates that feed algae.[49]
Lanthanum oxide additive to tungsten is used in gas tungsten arc welding electrodes, as a substitute for radioactive thorium.[50][51]
Various compounds of lanthanum and other rare-earth elements (oxides, chlorides, etc.) are components of various catalysis, such as petroleum cracking catalysts.[52]
Lanthanum-barium radiometric dating is used to estimate age of rocks and ores, though the technique has limited popularity.[53]
Lanthanum carbonate was approved as a medication (Fosrenol, Shire Pharmaceuticals) to absorb excess phosphate in cases of end-stage renal failure.[54]
Lanthanum fluoride is used in phosphor lamp coatings. Mixed with europium fluoride, it is also applied in the crystal membrane of fluoride ion-selective electrodes.[8]
Like horseradish peroxidase, lanthanum is used as an electron-dense tracer in molecular biology.[55]
Lanthanum-modified bentonite (or phoslock) is used to remove phosphates from water in lake treatments.[56]
Biological role[edit]
Lanthanum has no known biological role in humans. The element is very poorly absorbed after oral administration and when injected its elimination is very slow. Lanthanum carbonate (Fosrenol) was approved as a phosphate binder to absorb excess phosphate in cases of end stage renal disease.[54]
While lanthanum has pharmacological effects on several receptors and ion channels, its specificity for the GABA receptor is unique among trivalent cations. Lanthanum acts at the same modulatory site on the GABA receptor as zinc, a known negative allosteric modulator. The lanthanum cation La3+ is a positive allosteric modulator at native and recombinant GABA receptors, increasing open channel time and decreasing desensitization in a subunit configuration dependent manner.[57]
Lanthanum is an essential cofactor for the methanol dehydrogenase of the methanotrophic bacterium Methylacidiphilum fumariolicum SolV, although the great chemical similarity of the lanthanides means that it may be substituted with cerium, praseodymium, or neodymium without ill effects, and with the smaller samarium, europium, or gadolinium giving no side effects other than slower growth.[58]
Precautions[edit]
Lanthanum has a low to moderate level of toxicity and should be handled with care. The injection of lanthanum solutions produces hyperglycemia, low blood pressure, degeneration of the spleen and hepatic alterations.[59] The application in carbon arc light led to the exposure of people to rare earth element oxides and fluorides, which sometimes led to pneumoconiosis.[60][61] As the La3+ ion is similar in size to the Ca2+ ion, it is sometimes used as an easily traced substitute for the latter in medical studies.[62] Lanthanum, like the other lanthanides, is known to affect human metabolism, lowering cholesterol levels, blood pressure, appetite, and risk of blood coagulation. When injected into the brain, it acts as a painkiller, similarly to morphine and other opiates, though the mechanism behind this is still unknown.[62]
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Notes[edit]
Jump up ^ Lanthanum is not always considered to be a lanthanide, partly because the term "lanthanide" means "like lanthanum" and therefore logically cannot include lanthanum itself, and also because lanthanum lacks the 4f electrons characteristic of the rest of the lanthanide series. This use of the term "lanthanide" is thus limited to the fourteen elements between cerium and lutetium inclusive.[5]
References[edit]
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Jump up ^ Lide, D. R., ed. (2005). "Magnetic susceptibility of the elements and inorganic compounds". CRC Handbook of Chemistry and Physics (PDF) (86th ed.). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5.
Jump up ^ Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4.
Jump up ^ "Monazite-(Ce) Mineral Data". Webmineral. Retrieved 10 July 2016.
Jump up ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 1227. ISBN 0-08-037941-9.
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^ Jump up to: a b Greenwood and Earnshaw, p. 1106
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Jump up ^ Cullity, B. D. and Graham, C. D. (2011) Introduction to Magnetic Materials, John Wiley & Sons, ISBN 9781118211496
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Jump up ^ Greenwood and Earnshaw, p. 1429
^ Jump up to: a b c d e f Lide, D. R., ed. (2005). CRC Handbook of Chemistry and Physics (86th ed.). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5.
Jump up ^ The Radiochemistry of the Rare Earths, Scandium, Yttrium, and Actinium
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Jump up ^ Fukai, Y. (2005). The Metal-Hydrogen System, Basic Bulk Properties, 2d edition. Springer. ISBN 978-3-540-00494-3.
^ Jump up to: a b Greenwood and Earnshaw, pp. 1108–9
Jump up ^ Greenwood and Earnshaw, p. 1110
Jump up ^ "The Discovery and Naming of the Rare Earths". Elements.vanderkrogt.net. Retrieved 23 June 2016.
^ Jump up to: a b Greenwood and Earnshaw, p. 1424
Jump up ^ Weeks, Mary Elvira (1932). "The Discovery of the Elements: XI. Some Elements Isolated with the Aid of Potassium and Sodium:Zirconium, Titanium, Cerium and Thorium". The Journal of Chemical Education. 9 (7): 1231–1243. Bibcode:1932JChEd...9.1231W. doi:10.1021/ed009p1231.
Jump up ^ See:
(Berzelius) (1839) "Nouveau métal" (New metal), Comptes rendus, 8 : 356-357. From p. 356: "L'oxide de cérium, extrait de la cérite par la procédé ordinaire, contient à peu près les deux cinquièmes de son poids de l'oxide du nouveau métal qui ne change que peu les propriétés du cérium, et qui s'y tient pour ainsi dire caché. Cette raison a engagé M. Mosander à donner au nouveau métal le nom de Lantane." (The oxide of cerium, extracted from cerite by the usual procedure, contains almost two fifths of its weight in the oxide of the new metal, which differs only slightly from the properties of cerium, and which is held in it so to speak "hidden". This reason motivated Mr. Mosander to give to the new metal the name Lantane.)
(Berzelius) (1839) "Latanium — a new metal," Philosophical Magazine, new series, 14 : 390-391.
Jump up ^ "It's Elemental — The Periodic Table of Elements". Jefferson Lab. Archived from the original on 29 April 2007. Retrieved 2007-04-14.
Jump up ^ Greenwood and Earnshaw, p. 1103
^ Jump up to: a b c Greenwood and Earnshaw, p. 1426–9
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Jump up ^ "As hybrid cars gobble rare metals, shortage looms". Reuters 2009-08-31. 2009-08-31.
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Jump up ^ Uchida, H. (1999). "Hydrogen solubility in rare earth based hydrogen storage alloys". International Journal of Hydrogen Energy. 24 (9): 871. doi:10.1016/S0360-3199(98)00161-X.
Jump up ^ C. R. Hammond (2000). The Elements, in Handbook of Chemistry and Physics (81st ed.). CRC press. ISBN 0-8493-0481-4.
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Jump up ^ Hendrick, James B. (1985). "Rare Earth Elements and Yttrium". Mineral Facts and Problems. Bulletin 675. Bureau of Mines. p. 655.
Jump up ^ Kim, K; Shim, Kwang Bo (2003). "The effect of lanthanum on the fabrication of ZrB2–ZrC composites by spark plasma sintering". Materials Characterization. 50: 31. doi:10.1016/S1044-5803(03)00055-X.
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Jump up ^ C. K. Gupta; Nagaiyar Krishnamurthy (2004). Extractive metallurgy of rare earths. CRC Press. p. 441. ISBN 0-415-33340-7.
Jump up ^ S. Nakai; A. Masuda; B. Lehmann (1988). "La-Ba dating of bastnaesite" (PDF). American Mineralogist. 7: 1111.
^ Jump up to: a b "FDA approves Fosrenol(R) in end-stage renal disease (ESRD) patients". 28 October 2004. Retrieved 2009-06-06.
Jump up ^ Chau YP; Lu KS (1995). "Investigation of the blood-ganglion barrier properties in rat sympathetic ganglia by using lanthanum ion and horseradish peroxidase as tracers". Acta Anatomica. 153 (2): 135–144. ISSN 0001-5180. PMID 8560966. doi:10.1159/000313647.
Jump up ^ Hagheseresht; Wang, Shaobin; Do, D. D. (2009). "A novel lanthanum-modified bentonite, Phoslock, for phosphate removal from wastewaters". Applied Clay Science. 46 (4): 369–375. doi:10.1016/j.clay.2009.09.009.
Jump up ^ Boldyreva, A. A. (2005). "Lanthanum Potentiates GABA-Activated Currents in Rat Pyramidal Neurons of CA1 Hippocampal Field". Bulletin of Experimental Biology and Medicine. 140 (4): 403–5. PMID 16671565. doi:10.1007/s10517-005-0503-z.
Jump up ^ Pol, Arjan; Barends, Thomas R. M.; Dietl, Andreas; Khadem, Ahmad F.; Eygensteyn, Jelle; Jetten, Mike S. M.; Op Den Camp, Huub J. M. (2013). "Rare earth metals are essential for methanotrophic life in volcanic mudpots". Environmental Microbiology. 16 (1): 255–64. PMID 24034209. doi:10.1111/1462-2920.12249.
Jump up ^ Pof. Dr. M. Zafar Iqbal. Elements in Health and Disease. Dr. Ahsan Iqbal. pp. 23–. GGKEY:KEU6L0DDWZJ.
Jump up ^ Dufresne, A.; Krier, G.; Muller, J.; Case, B.; Perrault, G. (1994). "Lanthanide particles in the lung of a printer". Science of the Total Environment. 151 (3): 249–252. PMID 8085148. doi:10.1016/0048-9697(94)90474-X.
Jump up ^ Waring, P. M.; Watling, R. J. (1990). "Rare earth deposits in a deceased movie projectionist. A new case of rare earth pneumoconiosis". The Medical journal of Australia. 153 (11–12): 726–30. PMID 2247001.
^ Jump up to: a b Emsley, John (2011). Nature's building blocks: an A-Z guide to the elements. Oxford University Press. pp. 266–77. ISBN 9780199605637.
Bibliography[edit]
Greenwood, Norman N.; Earnshaw, Alan (1984). Chemistry of the Elements. Oxford: Pergamon Press. ISBN 0-08-022057-6.
Further reading[edit]
The Industrial Chemistry of the Lanthanons, Yttrium, Thorium and Uranium, by R. J. Callow, Pergamon Press, 1967
Extractive Metallurgy of Rare Earths, by C. K. Gupta and N. Krishnamurthy, CRC Press, 2005
Nouveau Traite de Chimie Minerale, Vol. VII. Scandium, Yttrium, Elements des Terres Rares, Actinium, P. Pascal, Editor, Masson & Cie, 1959
Chemistry of the Lanthanons, by R. C. Vickery, Butterworths 1953
[hide]
v
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Periodic table
(Large cells)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
1
H He
2
Li Be B C N O F Ne
3
Na Mg Al Si P S Cl Ar
4
K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
5
Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
6
Cs Ba La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
7
Fr Ra Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og
Alkali metal Alkaline earth metal Lanthanide Actinide Transition metal Post-transition metal Metalloid Polyatomic nonmetal Diatomic nonmetal Noble gas Unknown
chemical
properties
[show]
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Lanthanum compounds
LaB6
LaBr3
LaC2
LaCl3
La2(CO3)3
La2O3
La(OH)3
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values: લેન્થેનમ – Gujarati

values: Лантан – Kalmyk

values: लैन्थनम – Hindi

values:
https://hr.wikipedia.org/wiki/Lantan
Lantan – Croatian
hr
hr
interlanguage-link-target

values:
https://io.wikipedia.org/wiki/Lantano
Lantano – Ido
io
io
interlanguage-link-target

values:
https://id.wikipedia.org/wiki/Lantanum
Lantanum – Indonesian
id
id
interlanguage-link-target

values:
https://ia.wikipedia.org/wiki/Lanthano
Lanthano – Interlingua
ia
ia
interlanguage-link-target

values:
https://is.wikipedia.org/wiki/Lantan
Lantan – Icelandic
is
is
interlanguage-link-target

values:
https://it.wikipedia.org/wiki/Lantanio
Lantanio – Italian
it
it
interlanguage-link-target

values:
https://jv.wikipedia.org/wiki/Lantanum
Lantanum – Javanese
jv
jv
interlanguage-link-target

values: ಲ್ಯಾಂಥಾನಮ್ – Kannada

values: ლანთანი – Georgian

values: Лантан – Kazakh

values: Лантан – Komi

values: Лантан – Kyrgyz

values:
https://la.wikipedia.org/wiki/Lanthanum
Lanthanum – Latin
la
la
interlanguage-link-target

values:
https://lb.wikipedia.org/wiki/Lanthan
Lanthan – Luxembourgish
lb
lb
interlanguage-link-target

values:
https://lt.wikipedia.org/wiki/Lantanas
Lantanas – Lithuanian
lt
lt
interlanguage-link-target

values:
https://lij.wikipedia.org/wiki/Lantagno
Lantagno – Ligurian
lij
lij
interlanguage-link-target

values: लँथेनम – Marathi

values:
https://ms.wikipedia.org/wiki/Lantanum
Lantanum – Malay
ms
ms
interlanguage-link-target

values: လန်သနမ် – Burmese

values:
https://nl.wikipedia.org/wiki/Lanthaan
Lanthaan – Dutch
nl
nl
interlanguage-link-target

values: ल्यान्थानम – Newari

values:
https://no.wikipedia.org/wiki/Lantan
Lantan – Norwegian
no
no
interlanguage-link-target

values:
https://nn.wikipedia.org/wiki/Lantan
Lantan – Norwegian Nynorsk
nn
nn
interlanguage-link-target

values:
https://oc.wikipedia.org/wiki/Lantani
Lantani – Occitan
oc
oc
interlanguage-link-target

values: ଲାନ୍ଥାନମ – Odia

values: ਲੈਂਥਨਮ – Punjabi

values: ल्यान्थानम – Pali

values:
https://pms.wikipedia.org/wiki/Lantani
Lantani – Piedmontese
pms
pms
interlanguage-link-target

values:
https://pl.wikipedia.org/wiki/Lantan
Lantan – Polish
pl
pl
interlanguage-link-target

values:
https://ro.wikipedia.org/wiki/Lantan
Lantan – Romanian
ro
ro
interlanguage-link-target

values:
https://qu.wikipedia.org/wiki/Lanthanu
Lanthanu – Quechua
qu
qu
interlanguage-link-target

values: Лантан – Russian

values: Лантан – Sakha

values: लेन्थेनम – Sanskrit

values:
https://stq.wikipedia.org/wiki/Lanthan
Lanthan – Saterland Frisian
stq
stq
interlanguage-link-target

values:
https://sq.wikipedia.org/wiki/Lantani
Lantani – Albanian
sq
sq
interlanguage-link-target

values:
https://scn.wikipedia.org/wiki/Lantaniu
Lantaniu – Sicilian
scn
scn
interlanguage-link-target

values:
https://sl.wikipedia.org/wiki/Lantan
Lantan – Slovenian
sl
sl
interlanguage-link-target

values: interlanguage-link interwiki-sl badge-Q17437796 badge-featuredarticle

values:
https://so.wikipedia.org/wiki/Lanthanum
Lanthanum – Somali
so
so
interlanguage-link-target

values: Лантан – Serbian

values:
https://sh.wikipedia.org/wiki/Lantan
Lantan – Serbo-Croatian
sh
sh
interlanguage-link-target

values:
https://fi.wikipedia.org/wiki/Lantaani
Lantaani – Finnish
fi
fi
interlanguage-link-target

values:
https://sv.wikipedia.org/wiki/Lantan
Lantan – Swedish
sv
sv
interlanguage-link-target

values:
https://tl.wikipedia.org/wiki/Lantano
Lantano – Tagalog
tl
tl
interlanguage-link-target

values: இலந்தனம் – Tamil

values: Лантан – Tatar

values: లాంథనం – Telugu

values: แลนทานัม – Thai

values:
https://tr.wikipedia.org/wiki/Lantan
Lantan – Turkish
tr
tr
interlanguage-link-target

values: لینتھانم – Urdu

values: لانتان – Uyghur

values:
https://vep.wikipedia.org/wiki/Lantan
Lantan – Veps
vep
vep
interlanguage-link-target

values:
https://vi.wikipedia.org/wiki/Lantan
Lantan – Vietnamese
vi
vi
interlanguage-link-target

values:
https://war.wikipedia.org/wiki/Lantano
Lantano – Waray
war
war
interlanguage-link-target

values:
https://yo.wikipedia.org/wiki/Lanthanum
Lanthanum – Yoruba
yo
yo
interlanguage-link-target

values:
https://zh.wikipedia.org/wiki/%E9%95%A7
镧 – Chinese
zh
zh
interlanguage-link-target

values:
suggestions
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values: mediawiki ltr sitedir-ltr mw-hide-empty-elt ns-0 ns-subject page-Lanthanum rootpage-Lanthanum skin-vector action-view