Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 20    No. 12    December 2010

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Microstructure and electrical properties of Lu2O3-doped
ZnO-Bi2O3-based varistor ceramics
XU Dong(徐 东)1, 2, SHI Xiao-feng(史小锋)1, CHENG Xiao-nong(程晓农)1,
YANG Juan(杨 娟)1, FAN Yue-e(樊曰娥)1, YUAN Hong-ming(袁宏明)3<

1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China;
2. Research Center of Nano Science and Technology, Shanghai University, Shanghai 200444, China;
3. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry,
 Jilin University, Changchun 130012, China

Abstract:Lu2O3-doped ZnO-Bi2O3-based varistor ceramics samples were prepared by a conventional mixed oxide route and sintered at temperatures in the range of 900−1 000 °C, and the microstructures of the varistor ceramics samples were characterized by X-ray diffractometry (XRD) and scanning electron microscopy (SEM); at the same time, the electrical properties and V—I characteristics of the varistor ceramics samples were investigated by a DC parameter instrument for varistors. The results show that the ZnO-Bi2O3-based varistor ceramics with 0.3% Lu2O3 (molar fraction) sintered at 950 °C exhibit comparatively ideal comprehensive electrical properties. The XRD analysis of the samples shows the presence of ZnO, Bi-rich, spinel Zn7Sb2O12 and Lu2O3-based phases.

 

Key words: ZnO-Bi2O3 ceramics; varistor; rare earth; electrical properties

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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