Real structure and thermal properties of solid solutions of gamma-GdxDy1-xS1.5-y
V.V. Bakovets1, A.V. Sotnikov1, A.Sh. Agazhanov2, S.V. Stankus2
1Nikolayev Institute of Inorganic Chemistry SB RAS, Novosibirsk, Russia
2Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
Keywords: real structure, thermophysical properties, sulfides of rare earth elements, solid solutions
Abstract
The work is devoted to the study of temperature dependences of thermal conductivity (T = 300-770 K) of polycrystallic samples of solid solutions based on gadolinium and dysprosium sulfides of the compositions: γ-Gd x Dy1- x S1.49 (x = 0.1, 0.2, 0.3, 0.4). It has been found that the morphological features of samples, namely, the specific surface area of crystallites, which causes a change in the number of deformation centers, determines the value of the thermal conductivity of γ-Gd x Dy1- x S1.49 solid solutions. The presence of an abnormal decrease in thermal conductivity for the composition of x = 0.2 has been established. When the temperature increases to 770 K, this anomaly decreases slightly. The minimum value of the thermal conductivity coefficient of 0.68 ± 0.03 W/(m×K) is reached for the com-position under consideration·at 770 K.
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