Thermoelectric properties of B4C-SiBn (n=4, 6, 14) In-situ composites

Jianhui Li, Takashi Goto, Toshio Hirai

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

B4C-SiBn (n=4, 6, 14) in-situ composites were prepared by arc-melting and by a heat-treatment in an argon atmosphere. As-prepared specimens consisted of B4C, SiB14 and free-silicon. The SiB4 phase formed by the heat-treatment for 5.4 ks at 1663 K, and SiB6 phase was observed by the heat-treatment for 19.8 ks. The solid solution of Si into B4C and SiB14 was observed after the heat-treatment. The heat-treatment caused almost no change in thermal conductivity, but the decrease in electrical conductivity. The Seebeck coefficient (α) increased significantly by the heat-treatment. The stacking faults associated with metastable SiB4 phase formation could contribute to the increase in α. The greatest dimensionless figure-of-merit (ZT) value obtained in this study was 0.29 at T=1100 K.

Original languageEnglish
Pages (from-to)314-319
Number of pages6
JournalMaterials Transactions, JIM
Volume40
Issue number4
DOIs
Publication statusPublished - 1999 Jan 1

Keywords

  • Arc-melt
  • Boron carbide
  • Composite
  • Heat-treatment
  • High temperature
  • Silicon boride
  • Thermoelectric property

ASJC Scopus subject areas

  • Engineering(all)

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