An effective synthesis route for high-performance α-MgAgSb thermoelectric material

Keita Toh, Koichiro Suekuni, Katsuaki Hashikuni, Hirotaka Nishiate, Ushin Anazawa, Chul Ho Lee, Michitaka Ohtaki

Research output: Contribution to journalArticlepeer-review

Abstract

α-MgAgSb has been receiving attention as a thermoelectric material due to its high performance at 300–550 K. A MgAgSb sample synthesized by melting the constituent elements is known to contain secondary phases, which can be diminished by long-term heat treatment. However, less effort has been devoted to investigating the secondary phases and exploring an effective synthesis route to improve the sample purity. In this work, we showed that an as-melted sample comprised α-MgAgSb and large amounts of Ag3Sb and Mg4AgSb3. The secondary phases were successfully diminished/reacted through short-term ball milling and sintering processes. Secondary phases were further reduced by decreasing the starting Ag content, leading to the enhanced dimensionless figure of merit ZT of 0.4 at 300 K and 0.7 at 450 K. The synthesis route without long-term heat treatment is expected to contribute to efficient production of α-MgAgSb. Graphical abstract: [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)11265-11273
Number of pages9
JournalJournal of Materials Science
Volume57
Issue number24
DOIs
Publication statusPublished - Jun 2022

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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