Open AccessВлияние морфологических дефектов на теплофизические свойства gamma-Gd-=SUB=-2-=/SUB=-S-=SUB=-3-=/SUB=-
Author(s) -
А. В. Сотников,
В. В. Баковец,
A. Sh. Agazhanov,
С. В. Станкус,
Denis P. Pishchur,
В. В. Соколов
Publication year - 2018
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2018.03.45548.137
Subject(s) - crystallite , thermal conductivity , materials science , gadolinium , analytical chemistry (journal) , atmospheric temperature range , heat capacity , stoichiometry , ceramic , conductivity , mineralogy , crystallography , thermodynamics , chemistry , composite material , metallurgy , physics , chromatography
The temperature dependences of the heat capacity ( C _ p ) and the thermal conductivity (κ) in the temperature range from 300 to 773 K of polycrystalline gadolinium sulfide samples (γ-GdS_ y ) with the deviation of the composition from the integer stoichiometric were studied. It was found that the thermal conductivity of gadolinium sulfides decreases monotonically and reaches 0.74 W/(m K) at T = 773 K for the composition y = 1.479, which is much lower than for the known single-crystal samples. The influence of morphological defects (boundaries of crystallites and dislocations) on the intensity of scattering of phonons is studied. It has been established that ceramic samples of gadolinium sulphides have a large heat capacity and a lower thermal conductivity, in comparison with monocrystalline samples of the same composition.