Patterns of effect of spark plasma sintering temperature on microstructure of thermoelectric composites based on Bi2Te2.1Se0.9Bi2 matrix with cobalt inclusions
Year: 2023
Type: article
Abstract: Effect of spark plasma sintering temperature on the formation of Co filler particles in the Bi2Te2.1Se0.9 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 Bi2Te2.1Se0.9 + 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 Bi2Te2.1Se0.9 matrix with increasing in the sintering temperature. The concentration profiles of the Co distribution of in the Bi2Te2.1Se0.9 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.
Authors: M. Zhezhu, A. E. Vasil’ev, O. N. Ivanov
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W4394941189