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This article is cited in 1 scientific paper (total in 1 paper)
Micro- and nanocrystalline, porous, composite semiconductors
Determination of thermodynamic parameters in the Cu$_{1.95}$Ni$_{0.05}$S phase-transition regions
F. F. Alieva, G. A. Hasanovb, A. G. Rzaevac, M. B. Dzhafarova, G. M. Damirovad a Institute of Physics Azerbaijan Academy of Sciences, Baku, Azerbaijan
b Heydar Aliev Academy of State Security Service, Baku, Azerbaijan
c Azerbaijan State Pedagogical University, Baku, Azerbaijan
d Sumqayit State University
Abstract:
X-ray diffraction and differential thermal analysis data obtained in the Cu$_{1.95}$Ni$_{0.05}$S phase-transition region are analyzed. It is established that the low-temperature rhombic $\alpha$ phase in Cu$_{1.95}$Ni$_{0.05}$S transforms to the hexagonal $\beta$ phase at temperatures of 370–390 K and to the cubic $\gamma$ phase at temperatures of 740–765 K according to the scheme $\alpha\to\underset{370-390 K}{\alpha+\beta}\to\underset{740-765 K}{\beta+\gamma}\to\gamma$. It is determined (using the temperature dependence of differential thermal analysis) that the transition $\alpha\to\beta$ is accompanied by heat absorption while the transition $\beta\to\gamma$ is accompanied by heat release. It is found that both transitions are allowed and belong to the reconstructive type. Both transitions are found to occur in a fluctuation volume of $\sim$10$^{-20}$ cm$^3$ at temperature rates of 0.11 and 0.08 K$^{-1}$. It is demonstrated that the transition $\alpha\to\gamma$ is accompanied by alternation of the structures passing through the intermediate $\beta$ phase, which is incommensurate with respect to the $\alpha$ and $\gamma$ phases.
Received: 17.01.2017 Accepted: 23.01.2017
Citation:
F. F. Aliev, G. A. Hasanov, A. G. Rzaeva, M. B. Dzhafarov, G. M. Damirov, “Determination of thermodynamic parameters in the Cu$_{1.95}$Ni$_{0.05}$S phase-transition regions”, Fizika i Tekhnika Poluprovodnikov, 52:1 (2018), 76–82; Semiconductors, 52:1 (2018), 71–77
Linking options:
https://www.mathnet.ru/eng/phts5944 https://www.mathnet.ru/eng/phts/v52/i1/p76
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