Conductive SiC ceramics fabricated by spark plasma sintering

Kwang Joo Kim, Seung Hoon Jang, Young Wook Kim, Byung Koog Jang, Toshiyuki Nishimura

研究成果: ジャーナルへの寄稿学術誌査読

15 被引用数 (Scopus)

抄録

Bulk SiC ceramics were fabricated by spark plasma sintering, and the effects of Y2O3 addition on the structural and electrical properties were investigated. Raman spectroscopy revealed that SiC specimens with low Y2O3 content (0.01 and 0.05 wt%) contained a graphitic phase (1580 and 2710 cm−1) which was insignificant for high Y2O3 content (1.0 and 5.0 wt%). Carbon-rich SiC specimens exhibited p-type conduction character, while others exhibited n-type character. The p- and n-type SiC specimens had electrical resistivities around 10−2 Ω cm but exhibited photoluminescence spectra quite different from each other. The p-type character is primarily attributable to silicon vacancies (VSi), while the n-type character is ascribed to nitrogen substitution in carbon sites (NC) of the zincblende lattice. The change in conduction type with yttria addition in the SiC specimen can be understood in terms of a competition between the densities of VSi and NC.

本文言語英語
ページ(範囲)17892-17896
ページ数5
ジャーナルCeramics International
42
15
DOI
出版ステータス出版済み - 11月 15 2016
外部発表はい

!!!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
  • プロセス化学およびプロセス工学
  • 表面、皮膜および薄膜
  • 材料化学

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