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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.
1 Preparation. 2 Uses. 3 References. ... Lanthanum chloride is the inorganic compound with the ... lanthanum oxide is heated with ammonium chloride to produce the ...
The lanthanide trichlorides can generally be prepared by dissolving the oxide or carbonate with hydrochloric acid. They are produced commercially by carbothermic reaction of the oxide. To produce the anhydrous forms of these trichlorides, the ammonium chloride route is taken. The anhydrous lanthanide trichlorides have high melting points and ...
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]
Lanthanum cuprate usually refers to the inorganic compound with the formula CuLa 2 O 4. The name implies that the compound consists of a cuprate (CuO n] 2n-) salt of lanthanum (La 3+). In fact it is a highly covalent solid. It is prepared by high temperature reaction of lanthanum oxide and copper(II) oxide follow by annealing under oxygen. [1]
preparation of ammonium lanthanide chlorides. The reaction of an intimate mixture of lanthanide oxides with excess ammonium chloride produces anhydrous ammonium salts of the penta- and hexachlorides. Typical reaction conditions are hours at 230-250 °C. [4] Some lanthanides (as well as scandium and yttrium) form pentachlorides:
Calcination of lanthanum(III) sulfate in oxygen current at 750 °C: [4] La 2 (SO 4) 3 + O 2 → La 2 O 3 ·SO 3 + 2SO 3. The resulting product is reduced with hydrogen when heated: La 2 O 3 ·SO 3 + 4H 2 → La 2 O 2 S + 4H 2 O
Monazite-derived mischmetal typically was about 48% cerium, 25% lanthanum, 17% neodymium, and 5% praseodymium, with the balance being the other lanthanides. When bastnäsite started being processed for rare-earth content in about 1965, it too was converted to a version of rare-earth chloride and on to mischmetal. This version was higher in ...