Effect of Electric-Field-Induced Polarization on Positive Temperature Coefficient of Resistivity Characteristics of Semiconducting Barium Titanate Ceramics : Electrical Properties of Condensed Matter
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概要
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We observed distinct electric-field-induced birefringence in the vicinity of single-grain boundaries of semiconducting BaTiO_3 above the Curie temperature (T_c; 120℃); the single-grain boundaries exhibited a distinct positive temperature coefficient of resistivity (PTCR) anomaly in the same temperature range. The highest temperature at which we could observe birefringence shifted to higher temperatures with increasing electric field, and the maximum resistivity temperature of the PTCR characteristics also shifted to higher temperatures with increasing electric field. Electric field dependencies of the highest temperature of observed birefringence and the maximum resistivity temperature were found to be quite similar to each other. These results suggest that polarization induced by residual strain and/or electric field can exist in the vicinity of grain boundaries in semiconducting ceramics even above 120℃ (the inherent T_c of the bulk), and that the occurrence of the PTCR characteristics is closely related to the induced polarization.
- 社団法人応用物理学会の論文
- 2001-11-01
著者
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Kuwabara M
Univ. Tokyo Tokyo
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Kuwabara Makoto
Department Of Materials Engineering The University Of Tokyo
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HAMAMOTO Kouichi
Department of Materials Engineering, The University of Tokyo
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Kuwabara Makoto
Department Of Applied Chemistry Faculty Of Engineering Kyushu Institute Of Technology
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Hamamoto Kouichi
Department Of Materials Engineering The University Of Tokyo
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