Determination of Thermodynamic Parameters in the Cu1.95Ni0.05S Phase-Transition Regions
Tóm tắt
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.
Tài liệu tham khảo
B. N. Rolov, Smeared Phase Transitions (Zinatne, Riga, 1972) [in Russian].
L. Cuangminq, T. Schulmeyer, J. Brotz, A. Klein, and W. Jaedermann, Thin Solid Films 431, 472 (2003).
H. T. Evans, Jr., Z. Kristallogr. 150, 299 (1979).
S. Djurle, Acta Chem. Scand. 12, 1415 (1958).
E. H. Roseboom, Econom. Geol. 64, 641 (1966).
N. Alsen, Ged. Forening. Stokholm, Forhand 59, 111 (1931).
H. T. Evans, Jr., Z. Kristallogr. 150, 299 (1979).
B. N. Rolov, Physical Properties of Smeared Phase Transitions (Rizhsk. Gos. Univ., Riga, 1974) [in Russian].
B. N. Rolov, Izv. Akad. Nauk Latv. SSR, Ser. Fiz. Tekh. Nauk 4, 33 (1983).
K. P. Mamedov, M. F. Gadzhiev, and Z. D. Nurieva, Sov. Phys. Dokl. 21, 606 (1976).
S. A. Aliev and F. F. Aliev, Semiconductors 42, 394 (2008).
F. F. Aliev, M. B. Dzhafarov, and A. A. Saddinova, Phys. Solid State 52, 2164 (2010).
M. D. Burger, Sov. Phys. Crystallogr. 16, 959 (1971).
A. F. Wells, Structural Inorganic Chemistry (Clarendon, Oxford, 1986).
N. A. Alieva, K. A. Askerova, S. D. Bagirova, I. Ya. Aliev, Z. I. Suleimanov, F. M. Mustafaev, and A. S. Abbasov, Dokl. Akad. Nauk Azerb. 4 (3–4), 92 (1999).
R. A. Abbasov, Rep. Prog. Phys. 45, 587 (1982).
J. P. Jamet, Phase Trans. 11, 335 (1988).
N. Kh. Abrikosov, V. F. Bankina, M. A. Korzhuev, G. K. Domenskii, and O. A. Teplov, Sov. Phys. Solid State 25, 1678 (1983).
Yu. Ya. Gurevich, G. V. Reznik, and Yu. I. Kharkats, Sov. Phys. Solid State 20, 961 (1978).