Abstract

Textured samples of the Bi₁₉Gd_0.1Te₃, which is a thermoelectric material characterized by the formation of a lamellar grain structure, were prepared using spark plasma sintering. Lamellar layers consist of grains elongated in the plane parallel to the direction of the application of pressure during sintering. The properties of the samples measured in the direction perpendicular to the application of pressure correspond to microgranular structures, and those in the perpendicular direction to nanograined structures, which gradually transfer into microgranular structures with increasing sintering temperature. With a decrease in the grain size, the electrical resistance gradually increases, and the total thermal conductivity decreases, and these tendencies are most clearly manifested in the transition from micrograined to nanograined structures. The observed size effects are due to the scattering of electrons and phonons at grain boundaries.

中文翻译：

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火花等离子体烧结制备的具有纳米晶粒和微晶粒结构的碲化铋基织构材料的热电性能

摘要

Bi ₁₉ Gd _0.1 Te _{3 的}纹理样品是一种以形成层状晶粒结构为特征的热电材料，是使用放电等离子烧结制备的。层状层由在与烧结过程中施加压力的方向平行的平面中伸长的晶粒组成。在垂直于施加压力的方向上测量的样品的性质对应于微粒结构，而在垂直方向上测量的样品的性质对应于纳米晶粒结构，随着烧结温度的升高逐渐转变为微粒结构。随着晶粒尺寸的减小，电阻逐渐增大，总热导率降低，这些趋势在从微晶结构向纳米晶结构的转变中表现得最为明显。