Abstract
X-ray diffraction and differential thermal analysis data obtained in the Cu1.95Ni0.05S phase-transition region are analyzed. It is established that the low-temperature rhombic α phase in Cu1.95Ni0.05S transforms to the hexagonal β phase at temperatures of 370–390 K and to the cubic γ phase at temperatures of 740–765 K according to the scheme \(\alpha \to \mathop {\alpha + \beta }\limits_{370 - 390K} \to \mathop {\alpha + \gamma }\limits_{740 - 765K} \to \gamma \). It is determined (using the temperature dependence of differential thermal analysis) that the transition α → β is accompanied by heat absorption while the transition β → γ 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 ~10–20 cm3 at temperature rates of 0.11 and 0.08 K–1. It is demonstrated that the transition α → γ is accompanied by alternation of the structures passing through the intermediate β phase, which is incommensurate with respect to the α and γ phases.
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Original Russian Text © F.F. Aliev, H.A. Hasanov, A.G. Rzaeva, M.B. Jafarov, G.M. Damirov, 2018, published in Fizika i Tekhnika Poluprovodnikov, 2018, Vol. 52, No. 1, pp. 76–82.
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Aliev, F.F., Hasanov, H.A., Rzaeva, A.G. et al. Determination of Thermodynamic Parameters in the Cu1.95Ni0.05S Phase-Transition Regions. Semiconductors 52, 71–77 (2018). https://doi.org/10.1134/S1063782618010037
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DOI: https://doi.org/10.1134/S1063782618010037