Vacancy Control and Enhancement of Thermoelectric Properties of Al–Ir Cubic Quasicrystalline Approximant via High-Pressure Synthesis

DOI Web Site Web Site 被引用文献2件 参考文献17件
  • Iwasaki Yutaka
    Graduate School of Frontier Sciences, The University of Tokyo
  • Kitahara Koichi
    Graduate School of Frontier Sciences, The University of Tokyo AIST–U Tokyo, Advanced Operando-Measurement Technology Open Innovation Laboratory (OPERANDO–OIL), National Institute of Advanced Industrial Science and Technology (AIST)
  • Kimura Kaoru
    Graduate School of Frontier Sciences, The University of Tokyo AIST–U Tokyo, Advanced Operando-Measurement Technology Open Innovation Laboratory (OPERANDO–OIL), National Institute of Advanced Industrial Science and Technology (AIST)

この論文をさがす

抄録

<p>Although the binary Al–Ir cubic quasicrystalline approximant has been expected to be a narrow-gap semiconductor, it has not yet been produced because the presence of Al site vacancies causes excess hole doping. We suggest that high-pressure synthesis (HPS) can effectively reduce these vacancies. In this work, we investigated how HPS affected the structural and thermoelectric properties of an Al–Ir quasicrystalline approximant, finding that the sample made by HPS had a larger Seebeck coefficient than a sample made by conventional spark plasma sintering (SPS). Further, applying high pressure increased the lattice constant and measured Al composition by increasing the number of Al atoms in the Ir12 icosahedral cluster. These results show that HPS suppressed vacancies in the cluster, which doubled the dimensionless figure of merit zT.</p><p> </p><p>This Paper was Originally Published in Japanese in J. Thermoelec. Soc. Jpn. 16 (2020) 139–143.</p>

収録刊行物

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 61 (11), 2079-2082, 2020-11-01

    公益社団法人 日本金属学会

被引用文献 (2)*注記

もっと見る

参考文献 (17)*注記

もっと見る

関連プロジェクト

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ