Effect of Oxygen Vacancy and Oxygen Vacancy Migration on Dielectric Response of BaTiO3-Based Ceramics
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概要
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The effects of oxygen vacancies and their migrations on the dielectric responses of pure BaTiO3 (BT) ceramics and (Ba0.9Ca0.1)1.01(Ti0.9Zr0.1)O3 (BCTZ) ceramics, where portions of Ba and Ti were respectively substituted with Ca and Zr, were studied using wideband dielectric spectroscopy. The decrease in the dipole polarization of BT ceramics after annealing in a reducing atmosphere was due to domain-wall clamping by oxygen vacancies, while that of ionic polarization was attributable to lattice hardening by the incorporation of oxygen vacancies into the BT lattices. The dipole polarization of BCTZ ceramics indicated the same change as did that of BT ceramics after annealing, but the ionic polarization was independent of $P$O2 in annealing because of the anti-reducing behavior of BCTZ ceramics. The oxygen vacancy migration in BCTZ ceramics could be detected as a change of wideband dielectric spectra. The change observed only in the dipole polarization could be explained the oxygen vacancy migration from the anode to the cathode.
- 2011-03-25
著者
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Hoshina Takuya
Graduate School Of Science And Engineering Tokyo Institute Of Technology
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Choi Youn-kyu
Graduate School Of Science And Engineering Tokyo Institute Of Technology
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Tsurumi Takaaki
Graduate School Of Science And Engineering Tokyo Institute Of Technology
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Takeda Hiroaki
Graduate School Of Materials Science Nara Institute Of Science And Technology (naist)
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Choi Youn-Kyu
Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8552, Japan
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Takeda Hiroaki
Graduate School of Material Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama-cho, Ikoma, Nara 630-0192, Japan
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Tsurumi Takaaki
Graduate School of Materials Science and Technology, Tokyo Institute of Technology, Meguro, Tokyo 152-8552, Japan
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