Real structure and thermal properties of solid solutions of γ-GdxDy1−xS1.5−y

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 Dy 1− x S 1.49 ( x = 0.1, 0.2, 0.3, 0.4). It has been found that the morphologica...

Full description

Saved in:
Bibliographic Details
Published in:Thermophysics and aeromechanics 2020-05, Vol.27 (3), p.439-448
Main Authors: Bakovets, V. V., Sotnikov, A. V., Agazhanov, A. Sh, Stankus, S. V.
Format: Article
Language:English
Subjects:
Composition
Crystallites
Dysprosium
Gadolinium
Heat conductivity
Heat transfer
Physics
Physics and Astronomy
Solid solutions
Thermal conductivity
Thermodynamic properties
Thermodynamics
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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 Dy 1− x S 1.49 ( 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 Dy 1− x S 1.49 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 composition under consideration at 770 K.
ISSN:0869-8643
1531-8699
DOI:10.1134/S0869864320030129