Characterization of oxygen vacancy defects in Ba1−xCaxTiO3 insulating ceramics using electron paramagnetic resonance technique

The electron paramagnetic resonance (EPR) technique was employed to detect oxygen vacancy defects in the tetragonal Ba1−xCaxTiO3 (x = 0.03) ceramics (BCa3T) prepared via the mixed oxide route at 1300-1500 °C. In the rhombohedral phase below −100 °C, an EPR signal at g = 1.955 appeared in the insulat...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2016-01, Vol.55 (1)
Main Authors: Lu, Da-Yong, Yuan, Long-Fei, Liang, Wei-Na, Zhu, Zhao-Bin
Format: Article
Language:English
Online Access:Get full text
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Summary:The electron paramagnetic resonance (EPR) technique was employed to detect oxygen vacancy defects in the tetragonal Ba1−xCaxTiO3 (x = 0.03) ceramics (BCa3T) prepared via the mixed oxide route at 1300-1500 °C. In the rhombohedral phase below −100 °C, an EPR signal at g = 1.955 appeared in the insulating BCa3T with an electrical resistivity of 108 Ω cm and was assigned to ionized oxygen vacancy defects. BCa3T prepared at 1300 °C showed a temperature-stable X6S dielectric specification ( ′ = 1750). Three types of vacancy defect, namely, Ba, Ti, and O vacances, could coexist in BCa3T owing to the partial Ti-site occupation by Ca2+.
ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.55.011501