Some Features of Thermophysical Properties of γ-Gd2S3 Ceramics Based on Real Structure Full article
Journal |
Journal of the American Ceramic Society
ISSN: 0002-7820 , E-ISSN: 1551-2916 |
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Output data | Year: 2018, Volume: 101, Pages: 4773-4782 Pages count : 10 DOI: 10.1111/jace.15735 | ||||||
Tags | rare earth, real structure, sulfides, thermophysical properties, vacancies | ||||||
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Abstract:
The heat capacity Cp, thermal diffusivity χT, and lattice thermal conductivity κlatt of ceramic solid solutions of sesquisulfides Gd3- xVG d, xS4 (0 < x < 0.33) in the temperature range 300-700 K has been studied. Changing the real structure, namely the concentrations of vacancies (NV) and deformation (ND c) centers of polycrystals, significantly decreases κlatt. A deviation of composition from the stoichiometry 2:3 is accompanied by an increase in the specific area of the crystallite boundaries per unit volume, and, hence, the concentration of deformation centers DC increases. This observation was confirmed by examining the short-range order disturbance of the lattice and symmetry environment of the Gd3+ and S2- environment by Raman spectroscopy and the magnetic susceptibility Faraday method. Therefore the thermal diffusivity of gadolinium sesquisulfide is reduced because of the mean free path of phonons decrease. As a result, the thermal conductivity of the polycrystalline samples is reduced by 10%.
Cite:
Bakovets V.V.
, Sotnikov A.V.
, Agazhanov A.S.
, Stankus S.V.
, Korotaev E.V.
, Pishchur D.P.
, Shkatulov A.I.
Some Features of Thermophysical Properties of γ-Gd2S3 Ceramics Based on Real Structure
Journal of the American Ceramic Society. 2018. V.101. P.4773-4782. DOI: 10.1111/jace.15735 WOS Scopus РИНЦ РИНЦ
Some Features of Thermophysical Properties of γ-Gd2S3 Ceramics Based on Real Structure
Journal of the American Ceramic Society. 2018. V.101. P.4773-4782. DOI: 10.1111/jace.15735 WOS Scopus РИНЦ РИНЦ
Dates:
Submitted: | Jan 24, 2018 |
Accepted: | Apr 25, 2018 |
Published online: | May 14, 2018 |
Published print: | Oct 1, 2018 |
Identifiers:
Web of science | WOS:000440554000043 |
Scopus | 2-s2.0-85047409058 |
Elibrary | 38614808 , 41781511 |
Chemical Abstracts | 2018:930302 |
OpenAlex | W2801062441 |