Rapid synthesis of W18O49via reactive spark plasma sintering with controlled anisotropic thermoelectric properties

Nhat Quang Minh Tran, Michitaka Ohtaki, Koichiro Suekuni

研究成果: Contribution to journalArticle査読

1 被引用数 (Scopus)

抄録

Single phase W18O49sintered polycrystalline samples were successfully synthesized via one-step rapid reactive spark plasma sintering directly from commercially purchased WO3and WO2powders. Thermoelectric properties of the samples sintered at 15 and 30 MPa showed insignificant anisotropy, while a strong anisotropy was observed for the sample sintered at 50 MPa. The in-situ reaction under a high applied pressure allowed a preferential grain growth along the direction perpendicular to the pressure axis. The high anisotropy of the sample sintered at 50 MPa yielded the lowest thermal conductivity of 4 Wm-1K-1, resulting in a ZT value of 0.08 at 1073 K. This study offers the rapid and cost-effective preparation method for W18O49materials, which can also be applied for other tungsten suboxide phases, with partially controlled anisotropic properties by the influence of applied pressure for thermoelectric performance enhancement.

本文言語英語
ページ(範囲)344-350
ページ数7
ジャーナルEvergreen
8
2
DOI
出版ステータス出版済み - 6 2021

All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • セラミックおよび複合材料
  • 表面、皮膜および薄膜
  • 管理、モニタリング、政策と法律

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