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Proto‐Djurleite, a metastable form of cuprous sulphide
Author(s) -
Mulder B. J.
Publication year - 1973
Publication title -
kristall und technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0023-4753
DOI - 10.1002/crat.19730080708
Subject(s) - metastability , supercooling , hexagonal crystal system , phase (matter) , crystallography , materials science , crystal (programming language) , thermodynamics , condensed matter physics , chemistry , chemical physics , physics , organic chemistry , computer science , programming language
Abstract In a study of thin single crystals of cuprous sulphide we found that the high‐temperature hexagonal form of chalcosite (Cu 2 S) can be metastable with respect both to temperature (supercooling) and to composition. In reversible equilibrium with the metastable chalcosite a second metastable phase is formed, resembling djurleite (Cu 1.96 S), which we propose to call proto‐djurleite. When cooled to a critical temperature the crystal suddenly reverts to a mixture of the stable low‐temperature forms of chalcosite and djurleite. The boundaries of the metastable two‐phase region have been determined between its upper temperature limit, which is 93 °C, and 75 °C.