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Microstructure Features of Metal-Matrix Composites Based on Thermoelectric Bismuth Telluride Matrix and Ferromagnetic Filler

The formative predictables of the microstructure of metal-matrix composites, obtained using spark plasma sintering and consisting of polycrystalline thermoelectric bismuth telluride Bi2Te3 (composite matrix) and a ferromagnetic filler (Ni or Fe), were examined. It was determined that, in the course of spark plasma sintering, filler inclusions in the form of locally gradient inclusions of the nucleus–shell type (Ni@NiTe2 and Fe@FeTe2) are formed and randomly distributed in the Bi2Te3 textured matrix. The basic parameters of the microstructure of composites (inclusion size and extent of texturing of the matrix) strongly depend on the filler content.

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This work was performed with the financial support of the RF Ministry of Education and Science under project No. 0625-2020-0015.

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Correspondence to O. N. Ivanov.

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Translated from Steklo i Keramika, No. 11, pp. 23 – 29, November, 2021.

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Ivanov, O.N., Yapryntsev, M.N., Vasil’ev, A.E. et al. Microstructure Features of Metal-Matrix Composites Based on Thermoelectric Bismuth Telluride Matrix and Ferromagnetic Filler. Glass Ceram 78, 442–447 (2022).

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Key words

  • metal-matrix composites
  • spark plasma sintering
  • thermoelectric properties
  • texturing
  • locally gradient inclusions