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Preparation of Calcium Lanthanum Sulfide Powders via Alkoxide Sulfurization
Author(s) -
Han Yong,
Akinc Mufit
Publication year - 1991
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1991.tb06848.x
Subject(s) - lanthanum , alkoxide , sulfide , calcium , inorganic chemistry , chemistry , methanol , phase (matter) , amorphous solid , nuclear chemistry , materials science , crystallography , organic chemistry , catalysis
Calcium lanthanum sulfide powders were prepared by reacting methoxides of calcium and lanthanum with H 2 S. Alkoxide mixtures of various La/Ca ratios dispersed in methanol were reacted with H 2 S at 25° to 85°C and the amorphous gels obtained after the removal of methanol were heat‐treated in H 2 S for full sulfurization at various temperatures. Up to 500°C, cubic LaS 2 was the only crystalline phase present. Calcium lanthanum sulfide phase started to form at 550°C. In the temperature range of 650° to 750°C, single‐phase calcium lanthanum sulfide powders were obtained for La/Ca = 2.41 and 2.68.