The Effect of Bi2O3/SiO2 Molar Ratio and Annealing on the dc Degradation of ZnO Varistors

被引：7

作者：

Meng, Lei ^{[1
,2
]}

Li, Guorong ^{[1
]}

Zheng, Liaoying ^{[1
]}

Cheng, Lihong ^{[1
]}

Zeng, Jiangtao ^{[1
]}

Huang, Hualing ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Ceram, Key Lab Inorgan Funct Mat & Devices, Shanghai 200050, Peoples R China

[2] Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2011年 / 94卷 / 08期

关键词：

ZINC-OXIDE VARISTORS; BI2O3-SIO2; CERAMICS; SYSTEM;

D O I：

10.1111/j.1551-2916.2011.04654.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：

The dc electrical stability of ZnO varistors was effectively improved by controlling the composition proportion of Bi2O3 and SiO2 as well as annealing condition. The microstructure, current-voltage (I-V) property, and dc degradation characteristics are significantly affected by the molar ratio of Bi2O3 to SiO2 in composition. It is found that a phase transition from beta-Bi2O3 (with dissolved Si) to Bi12SiO20, with a volume contraction of 5.88%, occurred after annealing at 850 degrees C. The formed Bi12SiO20 plays an important role in improving the electrical stability by inhibiting the oxygen-desorption at the grain boundary.

引用

页码：2300 / 2303

页数：4

共 13 条

[1] MICROSTRUCTURE AND CRYSTAL-STRUCTURE OF BISMUTH OXIDE PHASES IN ZINC-OXIDE VARISTOR CERAMICS [J].