关于非对称纳米粒子制备的 Bi2Te2.7Se0.3/Teδ 复合材料的合成、微观结构和热电性能

IF 0.6 4区 物理与天体物理 Q4 PHYSICS, CONDENSED MATTER Semiconductors Pub Date : 2024-04-18 DOI:10.1134/s1063782624700027
M. N. Yapryntsev, M. S. Ozerov
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引用次数: 0

摘要

摘要--通过溶热合成初始粉末和随后的火花等离子烧结,获得了不同浓度(δ = 0.15、0.2、0.25 和 0.3)的 Bi2Te2.7Se0.3/Teδ复合材料。在烧结过程中,样品会产生纹理,因此片状晶粒会垂直于烧结过程中的加压方向(纹理轴线方向)分层排列。放大后,超一几何碲的浓度会降低纹理的程度。碲的浓度不会影响平均晶粒大小。超计量碲沿晶界分布,因此形成了复合材料特有的结构。碲在晶界的释放导致所获得材料的热电特性发生变化。随着超一几何碲浓度的增加,电阻率自然增加,总热导率降低。
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On the Synthesis, Microstructure, and Thermoelectric Properties of the Composite Material Bi2Te2.7Se0.3/Teδ Obtained from Asymmetric Nanoparticles

Abstract—

Composite materials Bi2Te2.7Se0.3/Teδ with varying concentration (δ = 0.15, 0.2, 0.25, and 0.3) are obtained by the solvothermal synthesis of initial powders and their subsequent spark plasma sintering. During the sintering process, the samples are textured, as a result of which lamellar grains are arranged in layers perpendicular to the direction of the application of pressure during sintering (the direction of the texture axis). Upon magnification, the concentration of superstoichiometric tellurium decreases the degree of texturing. The concentration of tellurium does not affect the average grain size. Superstoichiometric tellurium is distributed along the grain boundaries, as a result of which a structure characteristic of composite materials is formed. The release of tellurium at the grain boundaries leads to a change in the thermoelectric properties of the obtained materials. The electrical resistivity naturally increases, and the total thermal conductivity decreases with an increase in the concentration of superstoichiometric tellurium.

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来源期刊
Semiconductors
Semiconductors 物理-物理:凝聚态物理
CiteScore
1.50
自引率
28.60%
发文量
131
审稿时长
3-6 weeks
期刊介绍: Publishes the most important work in semiconductor research in the countries of the former Soviet Union. Covers semiconductor theory, transport phenomena in semiconductors, optics, magnetooptics, and electrooptics of semiconductors, semiconductor lasers and semiconductor surface physics. The journal features an extensive book review section.
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