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Lanthanum is a chemical element with the symbol La and the atomic number 57. It is a soft , ductile , silvery-white metal that tarnishes slowly when exposed to air. 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.
Lanthanum(III) oxide, also known as lanthana, chemical formula La 2 O 3, is an inorganic compound containing the rare earth element lanthanum and oxygen. It is used in some ferroelectric materials, as a component of optical materials, and is a feedstock for certain catalysts, among other uses.
Lanthanum acetylacetonate refers to the coordination complex with the formula La(C 5 H 7 O 2) 3. This anhydrous acetylacetonate complex has not been characterized well, but the dihydrate La(C 5 H 7 O 2) 3 (H 2 O) 2 has been characterized by X-ray crystallography. [2] [3] Upon heating under vacuum, the dihydrate converts to the oxo-cluster La 4 ...
Lanthanum(III) sulfide can be prepared from the effect of sulfur vapor on metallic lanthanum: 2 La + 3 S → La 2 S 3. It can also be prepared from the effect of hydrogen sulfide on lanthanum: 2 La + 3H 2 S → La 2 S 3 + 3 H 2. The effect of hydrogen sulfide on lanthanum oxide in the presence of reducing agents also produces lanthanum(III ...
Lanthanum(III) nitrate is any inorganic compound with the chemical formula La(NO 3) 3 ·xH 2 O. It is used in the extraction and purification of lanthanum from its ores. [5] The compound decomposes at 499°C to lanthanum oxide, nitric oxide and oxygen. [3]
LaNi 5 is a hexagonal intermetallic compound composed of rare earth element lanthanum and transition metal nickel. It presents a calcium pentacopper (CaCu 5) crystal structure. It is a melting compound with the same composition and has hydrogen storage capacity. [3]
Lanthanum acetate is an inorganic compound, a salt of lanthanum with acetic acid with the chemical formula La(CH 3 CO 2) 3. According to X-ray crystallography, anhydrous lanthanum acetate is a coordination polymer. Each La(III) center is nine-coordinate, with two bidentate acetate ligands and the remaining sites occupied by oxygens provided by ...
Lanthanum decahydride is a polyhydride or superhydride compound of lanthanum and hydrogen (LaH 10) that has shown evidence of being a high-temperature superconductor. It was the first metal superhydride to be theoretically predicted, [ 2 ] [ 3 ] synthesized, [ 4 ] and experimentally confirmed [ 5 ] to superconduct at near room-temperatures.