Phase transitions in copper chalcogenides: I. The copper‐selenium system
1971; Royal Netherlands Chemical Society; Volume: 90; Issue: 3 Linguagem: Inglês
10.1002/recl.19710900307
ISSN1878-7096
Autores Tópico(s)Organometallic Compounds Synthesis and Characterization
ResumoAbstract The thermal behaviour of copper selenides up to about 400°C has been studied by X‐ray diffraction at continuously variable temperature and by differential. The thermal behaviour of copper selenides up to about 400°C has been studied orthorhombic (pseudo‐rhombohedral) with a = 4.118, b = 2 × 7.032, c = 20.381 Å at 20°. The homogeneity range of the f.c.c. phase Cu 2‐x Se was found as 0.15 ≤ × ≤ 0.20 at 20°; the atomic arrangement in Cu 1,80 Se was determined. A superstructure of this phase is found below − 115°. CuSe is hexagonal (CuS‐type) above 120° ( a = 3.976. c = 17.243 Å at 140°), orthorhombic between 120° and about 50° ( a = 3.949. b = 6.935, c = 17.20 Å at 60°), and has a hexagonal superstructure at lower temperatures ( a = 14.20. c = 17.26 Å at 20°). The literature data on Cu 3 Se 2 and CuSe 2 were confirmed.
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