Patterns of effect of spark plasma sintering temperature on microstructure of thermoelectric composites based on Bi 2 Te 2.1 Se 0.9 Bi 2  matrix with cobalt inclusions

M. Zhezhu; Жежу М.; A. E. Vasil’ev; Васильев А. Е.; O. N. Ivanov; Иванов О. Н.

doi:10.31857/S0367676523701351

Patterns of effect of spark plasma sintering temperature on microstructure of thermoelectric composites based on Bi₂Te_2.1Se_0.9Bi₂matrix with cobalt inclusions

作者: Zhezhu M.¹, Vasil’ev A.E.², Ivanov O.N.³^,2
隶属关系:
1. Федеральное государственное бюджетное образовательное учреждение высшего образования “Белгородский государственный технологический университет имени В.Г. Шухова”
2. Belgorod State University
3. Belgorod State Technological University
期: 卷 87, 编号 6 (2023)
页面: 780-785
栏目: Articles
URL: https://journal-vniispk.ru/0367-6765/article/view/135396
DOI: https://doi.org/10.31857/S0367676523701351
EDN: https://elibrary.ru/VKIQHX
ID: 135396

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Effect of spark plasma sintering temperature on the formation of Co filler particles in the Bi₂Te_2.1Se_0.9 matrix has been examined. Owing to high-temperature diffusion redistribution of atoms in the matrix and filler materials and chemical interaction between these materials, in the Bi₂Te_2.1Se_0.9 + 0.33 wt % Co, core–shell filler particles (Co@CoTe₂) are formed. With increasing the sintering temperature, fraction of the “CoTe₂ shell” in the particles increases, while fraction of the “Co core” decreases. This behavior is due to an increasing in the diffusion coefficient of Co in the Bi₂Te_2.1Se_0.9 matrix with increasing in the sintering temperature. The concentration profiles of the Co distribution of in the Bi₂Te_2.1Se_0.9 matrix, governed by diffusion, are well described using Fick’s second law for diffusion from a limited source of a diffusing substance. The diffusion coefficient of Co increases with increasing un the sintering temperature in accordance with the Arrhenius law and with an activation energy of ~0.61 eV.

参考

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