DEPLETION-LAYER DIELECTRIC-PROPERTIES OF POSITIVE TEMPERATURE-COEFFICIENT OF RESISTANCE BARIUM-TITANATE

被引：34

作者：

WANG, DY ^{[1
]}

UMEYA, K ^{[1
]}

机构：

[1] GTE PMG,STANDISH,ME 04084

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 1990年 / 73卷 / 06期

关键词：

barium titanate; Curie temperature; defects; dielectric properties; electrical properties;

D O I：

10.1111/j.1151-2916.1990.tb09798.x

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

For pure and impurity‐added positive temperature coefficient of resistance (PTCR) barium titanate ceramic samples, a −11°C shift of the Curie point at the grain‐boundary/depletion‐layer region was observed. This result is obtained by fitting the PTCR grain‐boundary resistance and capacitance data to a theory which combines a double‐depletion‐layer model with the Devonshire thermodynamic theory of barium titanate. The parameters used in the fitting are obtained from independent experiments. The shift of the Curie point is believed to result from the grain‐boundary clamp ing effect near the cubic‐tetragonal phase transition point. Copyright © 1990, Wiley Blackwell. All rights reserved

引用

页码：1574 / 1581

页数：8

共 27 条

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[2]

BERGLUND CN, 1961, PHYS REV, V157, P358

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