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H. R. Gurbanov, M. B. Adigezalova, A. N. Mamedov, S. A. Guliyeva
Synthesis, crystal structure and
thermodynamic functions of new compounds GeSnSb4Te8
Abstract
For the first time the quaternary compounds
GeSnSb4Te8 formed in GeSnSb2Te4 –
SnSb2Te4 system at a
ratio of GeSnSb2Te4 : SnSb2Te4 =
1:1 have been studied by the various physical-chemical methods involving
thermodynamic calculations in a wide temperature range. The compound GeSnSb4Te8
congruently melts at 950 K. The
enthalpy of formation, standard entropy, and isobaric heat capacity of this compound consists ΔH2980 = –254,3 kJoule·mol–1, S2980 =
787,2 Joule·mol–1·K–1, cp,2980
= 342,6 joule·mol–1·K–1. Single crystals GeSnSb4Te8
have been obtained by the method of chemical transport reactions (HTR). The
parameters of the unit cell of the compound GeSnSb4Te8,
crystallizing in the orthorhombic system: a = 4,92 Å; b =
9,70 Å; c = 11,28 Å with space group Pnnm,
V = 837,44 Å3; Z = 2 have been defined.
Key words: compound, single crystals,
crystal structure, thermodynamic characteristics.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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