Electrical conductivity–defect structure correlation of variable-valence and fixed-valence acceptor-doped BaTiO3 in quenched state

Literature Information

Publication Date 2009-03-18
DOI 10.1039/B822381P
Impact Factor 3.676
Authors

Han-Ill Yoo, Tae-Sik Oh, Hyung-Soon Kwon, Dong-Kyu Shin, Jong-Sook Lee


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Abstract

Insulation resistance degradation of dielectric BaTiO3 is expected to be closely correlated to its defect structure frozen in from elevated processing temperatures. For BaTiO3, respectively doped with variable-valence (MnTi) and fixed-valence acceptors (AlTi), their defect structures were frozen in by quenching at different equilibrium oxygen activities in the range of −18 < log aO2≤ 0 at 1000 and 900 °C, respectively, and their electrical conductivities were measured against temperature in the range of 200 ≤T/K ≤ 494 by impedance spectroscopy. Frozen-in defect structures were calculated and compared with the conductivity as measured in the quenched state. A close correlation has been confirmed between the bulk conductivity as measured in the quenched state and the frozen-in defect structure as calculated. The effects of variable- and fixed-valence acceptor impurities on the defect structure and electrical conductivity in the quenched state are highlighted in the light of hole trapping, and the charge transport behavior in the quenched state is discussed.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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