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- Title
Electron Carrier Generation in a Refractory Oxide 12CaO·7Al<sub>2</sub>O<sub>3</sub> by Heating in Reducing Atmosphere: Conversion from an Insulator to a Persistent Conductor.
- Authors
Kim, Sung-Wng; Hayashi, Katsuro; Hirano, Masahiro; Hosono, Hideo; Tanaka, Isao
- Abstract
Electron carriers were generated in refractory oxide 12CaO·7Al2O3 (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.
- Subjects
THERMAL properties of oxides; REFRACTORY materials; ELECTRIC conductivity; ELECTRONS; OXIDES
- Publication
Journal of the American Ceramic Society, 2006, Vol 89, Issue 10, p3294
- ISSN
0002-7820
- Publication type
Article
- DOI
10.1111/j.1551-2916.2006.01213.x