Investigation of the PTCR effect in ZnO-NiO two-phase ceramics

被引：31

作者：

Lisjak, D ^{[1
]}

Zajc, I ^{[1
]}

Drofenik, M ^{[1
]}

Jamnik, J ^{[1
]}

机构：

[1] NATL INST CHEM,LJUBLJANA 1001,SLOVENIA

来源：

SOLID STATE IONICS | 1997年 / 99卷 / 1-2期

关键词：

ZnO; NiO; electrical resistivity; PTCR effect; percolation;

D O I：

10.1016/S0167-2738(97)00197-5

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A positive temperature coefficient of electrical resistivity (PTCR) in ZnO-NiO ceramics was observed and an attempt to explain its origin was made. According to electrical measurements, supported by dilatometric and microstructural investigations, the percolation principle was used for this purpose. A series of samples with different ZnOss and NiOss contents were prepared. The electrical resistivity of the samples was measured at different temperatures. ZnOss represents a low ohmic and NiOss represents a high ohmic phase. Monophase samples exhibited a strictly negative temperature coefficient of electrical resistivity (NTCR), while in some two-phase samples PTCR behaviour was observed. Results of electrical, dilatometric measurements and microstructural investigations indicated a possible explanation of PTCR behaviour on the basis of the percolation model.

引用

页码：125 / 135

页数：11

共 16 条

[1] MEASUREMENT MODELS FOR ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY .1. DEMONSTRATION OF APPLICABILITY [J].