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Influence of the temperature and composition on the crystal structure of the AgBiSe 2 ‐AgBiS 2 system
Author(s) -
Mitra Sunanda,
Berardan David
Publication year - 2017
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201700075
Subject(s) - phase diagram , crystal structure , phase (matter) , crystallography , thermal expansion , phase transition , diffraction , crystal (programming language) , trigonal crystal system , hexagonal phase , chemistry , transition temperature , hexagonal crystal system , materials science , thermodynamics , condensed matter physics , optics , physics , programming language , organic chemistry , computer science , metallurgy , superconductivity
We report on the synthesis and structural study of the system AgBiSe 2 ‐AgBiS 2 . Single phase samples have been synthesized for every compositions of the solid solution, we have studied the temperature dependence of the crystal structure using high‐temperature X‐ray diffraction coupled to DSC, and established the structural phase diagram of the system. From this diagram, sulfur‐rich samples exhibit one structural phase transition from a low temperature hexagonal phase to a high temperature cubic one, whereas selenium‐rich samples also exhibit an intermediate rhombohedral phase, with a limit between the 2‐phases and 3‐phases region at Se = 0.8. Besides, significant changes of the volume of the unit cell have been observed at the phase transitions, coupled to crystal structure dependent coefficients of thermal expansion.