Patterns of the Effect of the Temperature of Spark Plasma Sintering on the Microstructure of Thermoelectric Composites Based on the Matrix of BiTeSeBi with Cobalt Inclusions
Bulletin of the Russian Academy of Sciences: Physics, ISSN: 1934-9432, Vol: 87, Issue: 6, Page: 687-691
2023
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Article Description
Abstract: A study is performed of the effect the temperature of spark plasma sintering has on the formation of Co filler particles in the matrix of BiTeSe. Core–shell filler particles (Co@CoTe) form in BiTeSe + 0.33Co (wt %) due to the high-temperature diffusion redistribution of atoms in the matrix and filler materials, and the chemical interaction between these materials. The fraction of CoTe shells in the particles grows along with the temperature of sintering, while the fraction of the Co cores shrinks. This behavior is due to an increase in the diffusion coefficient of Co in the BiTeSe matrix as the temperature of sintering rises. The concentration profiles of the Co distribution of in the BiTeSe matrix, governed by diffusion, are described well by Fick’s second law of diffusion from a limited source of a diffusing substance. The coefficient of Co diffusion grows along with the temperature of sintering in accordance with the Arrhenius law, and with an energy of activation of ~0.61 eV.
Bibliographic Details
Allerton Press
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