Cooling rate effects on the electrical properties of TiO2-based varistor

被引：7

作者：

Hsiang, HI ^{[1
]}

Wang, SS ^{[1
]}

机构：

[1] Natl Cheng Kung Univ, Dept Resources Engn, Tainan 70101, Taiwan

来源：

MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY | 2006年 / 128卷 / 1-3期

关键词：

tiatnia oxide; varistor; microstructure; second phase;

D O I：

10.1016/j.mseb.2005.11.001

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The cooling rate effects on the microstructure development and electrical properties of TiO2 ceramics are studied using transmission electron microscopy (TEM), energy dispersion spectrometer (EDS) and X-ray diffractometer (XRD). Barium and bismuth were exsolved during cooling and reacted with rutile to form secondary phases, Ba2Ti9O20 and Bi2Ti4O11. Therefore, the acceptor concentration of Bi+3 (Bi'(Ti)) in the rutile grain near the grain boundary areas in furnace-cooled samples were lower than that in quenched samples. As the acceptor concentration decreased, the depletion width and harrier height decreased. Consequently, the quenched samples possessed higher nonlinear exponent (alpha) values than furnace-cooled samples. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：25 / 29

页数：5

共 8 条

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