Electron carrier generation in a refractory oxide 12CaO·7Al 2O3 by heating in reducing atmosphere: Conversion from an insulator to a persistent conductor

Sung Wng Kim, Katsuro Hayashi, Masahiro Hirano, Hideo Hosono, Isao Tanaka

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

Electron carriers were generated in refractory oxide 12CaO·7Al 2O3 (C12A7) through a thermal treatment in a reducing CO/CO2 atmosphere, and the reduction process was thermodynamically analyzed. Electrical-conductive C12A7, which had an electron concentration of ∼8 × 1019 cm-3 and an electrical conductivity of ∼4 S/cm at 300 K, was obtained by extracting free O2- ions in sub-nanometer-sized cages in the C12A7 lattice and leaving electrons behind. The enthalpy for this substitutive reaction is +425 kJ/mol, suggesting that stoichiometric C12A7 is more stable in air than the C12A7 electride.

Original languageEnglish
Pages (from-to)3294-3298
Number of pages5
JournalJournal of the American Ceramic Society
Volume89
Issue number10
DOIs
Publication statusPublished - Oct 1 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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