High-temperature solid–vapor and liquid–vapor transitions in binary and ternary chalcogenides La2S3, MoS2, Mo2S3 and LiInSe2

Abstract High heating rate thermo-microscopic analysis, analytical atomic-emission technique with inductively coupled plasma and differential dissolution method have been used to investigate solid–liquid and solid–liquid–vapor transitions of refractory chalcogenides La 2 S 3 , MoS 2 , Mo 2 S 3 and LiInSe 2 . The techniques were effective in determining the total pressure and vapor phase composition over the compounds in large temperature and pressure ranges. As a result, for compounds that evaporate incongruently, the melting points corresponding to their strict stoichiometry, the decomposition pressure–temperature relations, and other new results of the T – x phase diagrams for the La 3 S 4 –La 2 S 3 , Mo–MoS 2 , and Li 2 Se–LiInSe 2 systems were obtained.