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The thermal expansion and high temperature transformation of GeSe
Author(s) -
Wiedemeier H.,
Siemers P. A.
Publication year - 1975
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19754110110
Subject(s) - thermal expansion , orthorhombic crystal system , melting point , materials science , lattice (music) , crystallography , diffraction , melting temperature , thermal , condensed matter physics , crystal structure , thermodynamics , chemistry , composite material , optics , physics , acoustics
The thermal expansion of GeSe has been studied above room temperature up to the melting point of 670 ± 5°C by X‐ray diffraction techniques using a 190 mm Unicam high temperature camera. The thermal expansion of the crystallographic axes is linear with a distinct change of the expansion coeffients for all axes above 400°C. The relative changes of the axes indicate a rearrangement of the structure towards cubic symmetry with increasing temperature. The transformation of GeSe from the orthorhombic to a normal NaCl‐type structure is observed at 651 ± 5°C. The lattice parameter of the cubic form of GeSe is a 0 = 5.730 ± 0.003 Å at 656°C. The GeSe lattice remains cubic up to the melting point.