Abnormal Resistance Properties in PTCR Barium Titanate

Journal of Inorganic Materials

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Abnormal Resistance Properties in PTCR Barium Titanate

YU Xiaodong; LI Guorong

Laboratory of Functional Inorganic Materials; Shanghai Institute of Ceramics; Chinese Academy ofSciences Shanghai 200050 China

Received:1996-10-17 Revised:1997-01-16 Published:1997-06-20 Online:1997-06-20

Abstract

Abstract: In this paper the resistance properties of PTCR barium titanate [Ba_0.93Sr_0.03Ca_0.04TiO₃＋xmolY₂O₃＋1wt% AST] were measured near Curie-temperature by a complex impedance analyzer(HP4192A) from 10Hz to 10MHz. It was observed that PTCR sample exhibits an abnormal negative-temperature- coefficient in frequencies higher than 50kHz. This phenomenon can be simply explAlNed by the two dielectric-layer model, and with this model, the behavior of effectivedielectric constant and its loss in wide frequency range can be explained as well.

Key words: PTCR ceramics, high-frequency resistance, abnormal

YU Xiaodong,LI Guorong. Abnormal Resistance Properties in PTCR Barium Titanate[J]. Journal of Inorganic Materials.

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Abnormal Resistance Properties in PTCR Barium Titanate

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