The Effect of Oxygen Vacancies on the Dielectric Responses of BaTiO3 Based Ceramics in the Ultra-Wide Frequency Range

Tsurumi, Takaaki; Hoshina, Takuya; Choi, Youn Kyu; Takeda, Hiroaki; Oh, Jong Min

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Paper Titles

Preface
Ferroelectric Domain Structures and Piezoelectric Properties of Pb(Zr,Ti)O₃ Ceramics, p.3
Ferroelectric Polarization Properties in High-Performance Bismuth Sodium Titanate Single Crystals, p.7
Ferroelectricity of SrTiO₃ Thin Films Prepared by Dynamic-Aurora Pulsed Laser Deposition, p.11
The Effect of Oxygen Vacancies on the Dielectric Responses of BaTiO₃ Based Ceramics in the Ultra-Wide Frequency Range, p.15
First-Principles Calculations of Structural Changes Induced by Oxygen Vacancies in Tetragonal Phase BaTiO₃, p.19
Alkaline-Earth and Rare-Earth Elements and Oxygen Vacancy in BaTiO₃: Analyses by First-Principles Calculations and EXAFS, p.23
Molten Salt Synthesis of the Barium Strontium Titanate Ba_1-XSr_XTiO₃ with KOH-KNO₃, p.27
Relaxor Characteristics of BaTiO₃-Bi(Mg_1/2Ti_1/2)O₃ Ceramics, p.31

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Paper Title:

The Effect of Oxygen Vacancies on the Dielectric Responses of BaTiO₃ Based Ceramics in the Ultra-Wide Frequency Range

Periodical	Key Engineering Materials (Volume 485)
Main Theme	Electroceramics in Japan XIV
Edited by	Chazono Hirokazu, Fujihara Shinobu, Katayama Keiichi, Masumoto Hiroshi, Mizoguchi Teruyasu, Osada Minoru, Shinozaki Kazuo and Takeda Hiroaki
Pages	15-18
DOI	10.4028/www.scientific.net/KEM.485.15
Citation	Youn Kyu Choi et al., 2011, Key Engineering Materials, 485, 15
Online since	July, 2011
Authors	Youn Kyu Choi, Takuya Hoshina, Hiroaki Takeda, Jong Min Oh, Takaaki Tsurumi
Keywords	Barium Titanate, Dielectric Response, Domain Polarization, GLSL, Gradient Lattice Strain Layer, Ionic Polarization, Oxygen Vacancy, Oxygen Vacancy Migration
Price	US$ 28,-

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Abstract

The effect of oxygen vacancies and their migrations on the dielectric responses of BaTiO₃ (BT) ceramics and (Ba, Ca)(Ti, Zr)O₃ (BCTZ) ceramics was studied using wideband dielectric spectroscopy. Both dipole and ionic polarization of BT ceramics after annealing in a reducing atmosphere markedly decreased. To elucidate the decrease of dipole and ionic polarization, we observed the domain width and the crystal structure of BT ceramics annealed in different PO₂. The mass fractions of constituted phases in 90^o domain were calculated using the refinement of XRD patterns to explain the degradation of ionic polarization by oxygen vacancies. From the results above, we judged that the decrease of dipole polarization was due to the domain wall clamping by oxygen vacancies, while that of ionic polarization was attributable to the lattice hardening by the incorporation of oxygen vacancies into the BT lattice. In the case of BCTZ ceramics, dipole polarization showed the same way as BT ceramics with annealing conditions but the ionic polarization was independent of PO₂ in annealing because of anti-reducing behavior of BCTZ ceramics. On the basis of the effect of oxygen vacancy in BT ceramics and BCTZ ceramics, we could clarify the oxygen vacancy migration in BCTZ ceramics under high direct-current voltage (DCV).