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Published in: Journal of Materials Science 25/2021

01-06-2021 | Electronic materials

Investigation of interfacial reactions between metallic substrates and n-type bulk bismuth telluride thermoelectric material

Authors: Masanori Tashiro, Sohei Sukenaga, Koichi Ikemoto, Kozo Shinoda, Tsuyoshi Kajitani, Shigeru Suzuki, Hiroyuki Shibata

Published in: Journal of Materials Science | Issue 25/2021

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Abstract

In practical applications of bismuth telluride thermoelectric materials, the materials need to be connected with a metallic electrode before they can be used; however, the methodology for the direct joining of bismuth telluride to metallic materials remains undeveloped. Formation of liquid bismuth telluride should occur at the solidus temperature during the heating process, even if the chemical composition of a compound is only slightly different from the stoichiometric composition. It is possible that the liquid formed during heating can be used as a joining flux. To collect fundamental knowledge of the joining process at elevated temperatures, the present study experimentally confirmed the formation of liquid in the temperature region above its solidus and investigated the reactivity between the n-type bismuth telluride (n-BT) and metallic electrode materials at a temperature between the solidus and liquidus. We heated n-BT on three types of metallic substrates (Cu, Ni, and Fe) at 773 K in Ar. Among these metals, Cu is strongly reactive to n-BT, whereas Ni and Fe have modest reactivity to the n-BT sample. Our findings indicate that Ni or Fe could be candidate materials for the direct joining of n-BT with further optimization of the mechanical and electrical properties of the joined materials.

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Appendix
Available only for authorised users
Literature
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go back to reference Thermophysical Properties Handbook (2008) Yokendo, Japan Thermophysical Properties Handbook (2008) Yokendo, Japan
41.
go back to reference Barin I (1989) Thermochemical data of pure substances. VCH, Weinheim, New York Barin I (1989) Thermochemical data of pure substances. VCH, Weinheim, New York
Metadata
Title
Investigation of interfacial reactions between metallic substrates and n-type bulk bismuth telluride thermoelectric material
Authors
Masanori Tashiro
Sohei Sukenaga
Koichi Ikemoto
Kozo Shinoda
Tsuyoshi Kajitani
Shigeru Suzuki
Hiroyuki Shibata
Publication date
01-06-2021
Publisher
Springer US
Published in
Journal of Materials Science / Issue 25/2021
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-021-06198-1

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