Stress-Induced Resistivity Anomaly in Semiconducting Barium Titanate Ceramic Wire |
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Authors: | Hirofumi Matsuda Makoto Kuwabara Kohichi Hamamoto |
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Affiliation: | Department of Materials Science, University of Tokyo, Tokyo 113, Japan;Department of Applied Chemistry, Kyushu Institute of Technology, Fukuoka 804, Japan |
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Abstract: | Thin, semiconducting BaTiO3 ceramic wires prepared in the present study exhibited reversible stress-induced, nonlinear current—;voltage characteristics across several grain boundaries. A remarkable change in resistance with the application (by the three-point bending method) of only ∼1% tensile deformation indicated that the BaTiO3 wires may have potential as stress-sensing devices. Resistance in the BaTiO3 wires bot increased and decreased with increasing tensile stress parallel to the electric fields, far below the ferroelectric transition temperature, T c; in Sr-substituted wires near T c, on the other hand, resistance only increased. Detailed studies of the patterns and fluctuation of polarization at grain boundaries could be meaningful, because stress-sensing characteristics may be induced by changes in the relative angle between polarization vectors of adjacent grains. |
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