Abstract

The temperature dependences of the Seebeck coefficient, the electrical conductivity (T = 300–873 K) and also the heat conductivity coefficient, and the thermoelectric figure of merit (T = 300–770 K) of polycrystalline samples of solid solutions based on gadolinium and dysprosium sulfides of compositions γ‑Gd_xDy_1 – xS_1.49 (x = 0.1, 0.2, 0.3, 0.4) have been studied. It is found that the morphological features of the samples, namely, specifically of the crystallite surface that causes a change in the number of the deformation centers, determines the thermal conductivity of γ-Gd_xDy_1 – xS_1.49 solid solutions; the thermal conductivity of the composition with x = 0.2 is found to decrease anomalously. For this composition, the lowest values of the Seebeck coefficient –371 μV/K at 873 K, resistivity 880 μΩ m at 873 K, and the thermal conductivity coefficient 0.68 ± 0.03 W/m K at 770 K have been obtained; in this case, the thermoelectric figure of merit achieves the value ZT = 0.23.

中文翻译：

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γ-Gdx Dy 1 – x S 1.5 – y固溶陶瓷的形貌和热电性能

摘要

b和and的固溶多晶样品的塞贝克系数，电导率（T = 300–873 K）和导热系数以及热电性能因数（T = 300–770 K）与温度有关。组合物的硫化物镝γ的Gd _X的Dy _{1 -  X} š _1.49（X = 0.1，0.2，0.3，0.4）进行了研究。据发现，样品的形态特征，即，具体而言，是使在变形中心的数目的变化的微晶表面的，确定γ-Gd组成的热导率_X的Dy _{1 -  X} š _1.49固溶体; 发现x＝ 0.2的组合物的热导率反常降低。对于这种组成，在873 K时，塞贝克系数为–371μV/ K，在873 K时，电阻率为880μΩm，在770 K时，导热系数为0.68±0.03 W / m K的最低值；在这种情况下，热电品质因数达到ZT = 0.23。