Positive temperature coefficient in Ho-doped BaTiO3 ceramics

被引：24

作者：

Al-Shahrani, A ^{[1
]}

Abboudy, S ^{[1
]}

机构：

[1] King Khalid Univ, Fac Sci, Dept Phys, Solid State Phys Grp, Abha, Saudi Arabia

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2000年 / 61卷 / 06期

关键词：

thermistor; ceramics; crystal structure; elastic properties; dielectric properties;

D O I：

10.1016/S0022-3697(99)00397-2

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A series of Ho-doped barium titanate ceramics were prepared with dopant concentrations of: 0.03, 0.15, 0.27, 0.4 and 2.0 at.% Ho. DC resistivity measurements were carried out as a function of temperature from 10 up to 350 degrees C, The strong (exponential) anomalous increase of the resistivity at the Curie temperature, T-C approximate to 110 degrees C, was discussed in terms of Heywang model of positive temperature coefficient (PTC) of resistance. The inclusion of Ho has no effect on the room temperature bulk characteristics, as the samples were conductive at room temperature. The lowest dopant concentration was found to give the steeper resistivity rise at the Curie temperature and is recommended for practical applications in thermistors. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：955 / 959

页数：5

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