TY - JOUR
T1 - Electron carrier generation in a refractory oxide 12CaO·7Al 2O3 by heating in reducing atmosphere
T2 - Conversion from an insulator to a persistent conductor
AU - Kim, Sung Wng
AU - Hayashi, Katsuro
AU - Hirano, Masahiro
AU - Hosono, Hideo
AU - Tanaka, Isao
PY - 2006/10/1
Y1 - 2006/10/1
N2 - 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.
AB - 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.
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U2 - 10.1111/j.1551-2916.2006.01213.x
DO - 10.1111/j.1551-2916.2006.01213.x
M3 - Article
AN - SCOPUS:33749031299
SN - 0002-7820
VL - 89
SP - 3294
EP - 3298
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
IS - 10
ER -