Polymorphic transformations and thermal expansion in AgCuSe0.5(S,Te)0.5 crystals
- Authors: Aliyev Y.I.1, Asadov Y.G.1, Aliyeva R.D.1, Jabarov S.H.1
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Affiliations:
- Abdullaev Institute of Physics
- Issue: Vol 51, No 6 (2017)
- Pages: 732-739
- Section: Nonelectronic Properties of Semiconductors (Atomic Structure, Diffusion)
- URL: https://journals.rcsi.science/1063-7826/article/view/200043
- DOI: https://doi.org/10.1134/S1063782617060045
- ID: 200043
Cite item
Abstract
The high-temperature X-ray diffraction technique is used to study AgCuSe0.5(S,Te)0.5 crystals. It is shown that, at room temperature, the AgCuSe0.5S0.5 crystal is composed of Cu1.96S and AgCuSe phases. At a temperature of 695 K, these phases transform into a single face-centered cubic (fcc) phase. The transformation is reversible. The AgCuSe0.5Te0.5 composition consists of three phases, specifically, Cu2Te, AgCuSe, and a cubic phase. At 444 K, both orthorhombic phases simultaneously transform into a diamond-like cubic phase. In this transformation, the cubic phase plays the role of a seed. From the temperature dependence of the lattice parameters, the thermal-expansion coefficients of the phases involved in both compositions are calculated for the main crystallographic directions.
About the authors
Y. I. Aliyev
Abdullaev Institute of Physics
Email: yusifasadov@rambler.ru
Azerbaijan, Baku, AZ-1073
Y. G. Asadov
Abdullaev Institute of Physics
Author for correspondence.
Email: yusifasadov@rambler.ru
Azerbaijan, Baku, AZ-1073
R. D. Aliyeva
Abdullaev Institute of Physics
Email: yusifasadov@rambler.ru
Azerbaijan, Baku, AZ-1073
S. H. Jabarov
Abdullaev Institute of Physics
Email: yusifasadov@rambler.ru
Azerbaijan, Baku, AZ-1073