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Synthesis of mercury rare earth ternary sulfides
Author(s) -
HaoYong Chang,
YouRu Du
Publication year - 1985
Publication title -
acta chimica sinica english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 0256-7660
DOI - 10.1002/cjoc.19850030109
Subject(s) - cinnabar , chemistry , thermogravimetric analysis , mercury (programming language) , rare earth , quartz , ternary operation , analytical chemistry (journal) , torr , tetragonal crystal system , mineralogy , inorganic chemistry , crystal structure , crystallography , metallurgy , environmental chemistry , organic chemistry , thermodynamics , hematite , materials science , physics , programming language , computer science
Three new mercury rare earth sulfides have been synthesized by heating a mixture of the sesquisulfide of rare earth and cinnabar at 800°c for 25 h in an evacuated (10 −4 Torr) sealed quartz tube. Their general formula, Ln 4 HgS 7 (Ln = Tm, Yb and Lu), was determined by chemical analysis. These sulfides are tetragonal. Lattice parameters for Ln = Tm, Yb and Lu are: a = 11.09(2), 11.07(3) and 11.03(2)Å, c = 8.38(5), 8.35(2) and 8.33(2)Å respectively. These compounds are stable toward air and moisture at room temperature, but are oxidized slowly at elevated temperature. Thermogravimetric curves show that Tm 4 HgS 7 , Yb 4 HgS, and Lu 4 HgS 7 are decomposed and oxidized at 500°, 650° and 450°C respectively.