Complex Impedance Analysis of Nb-Doped (Ba<SUB>0.6</SUB>Sr<SUB>0.4</SUB>)TiO<SUB>3</SUB> PTC (Positive Temperature Coefficient) Thermistors
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- Yamamoto Toshishige
- Advanced Technology Research Laboratories, Sumitomo Metal Industries, Ltd.
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- Takao Satoshi
- SMI Techno-Research
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説明
Frequency-dependent complex impedances were measured in Nb-doped (Ba0.6Sr0.4)TiO3 PTC (positive temperature coefficient) ceramics. The complex impedance data were analyzed in Cole-Cole-type equivalent circuits by the computer fitting method in order to determine individual resistance and capacitance values of the bulk grain and grain boundary. The PTC effect was found to have originated from the temperature-sensitive behavior of the grain boundary resistance. The temperature dependences of dielectric constants of both the bulk grain and grain boundary calculated on the basis of the two-layer model agreed closely to those predicted by Heywang's model. The width and potential height of the grain boundary layer were estimated to be 0.26 μm and 0.1 eV, respectively, in the temperature range below −20°C. The estimated donor density of 6×1018 cm−3 was much lower than calculated from the amount of Nb2O5 added.
収録刊行物
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- Japanese Journal of Applied Physics
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Japanese Journal of Applied Physics 31 (9), 3120-3123, 1992
公益社団法人 応用物理学会
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詳細情報 詳細情報について
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- CRID
- 1571980078097664896
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- NII論文ID
- 130003472325
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- ISSN
- 00214922
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- 本文言語コード
- en
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- データソース種別
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- CiNii Articles