Characterization of ZnO Based Varistor Derived from Nano ZnO Powders and Ultrafine Dopants

材料科学技术（英文）, 2005, 21(2): 183-186.

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1.College of Material Science and Engineering, Sichuan University, Chengdu 610064, China

2.College of Material Science and Engineering, Sichuan University, Chengdu 610064, China

3.College of Material Science and Engineering, Sichuan University, Chengdu 610064, China

4.College of Material Science and Engineering, Sichuan University, Chengdu 610064, China

5.College of Material Science and Engineering, Sichuan University, Chengdu 610064, China

基金项目: This study was financially supported by the Fund for Youth Teacher of Education Ministry of China(2002123)

Characterization of ZnO Based Varistor Derived from Nano ZnO Powders and Ultrafine Dopants

Keywords： Zinc oxide (ZnO)

Nanosized ZnO powders were prepared with a two-step precipitation method. The average size of ZnO particles was about 80 nm and their size distribution was narrow. Combining with ultrafine additive powders, ZnO base varistor was produced via an oxide mixing route. ZnO varistor derived from normal reagent grade starting materials was investigated for comparison purpose. Outstanding microstructure of the ZnO varistor derived from nanosize ZnO powders and ultrafine dopants was obtained: uniform distribution of fine ZnO grains (less than 3 microns), grain boundary and the dopant position. Higher varistor voltage (U=492 V/mm) and nonlinear coefficient (α=56.2) as well as lower leakage current (IL=1.5μA) were achieved. The better electrical properties were attributed to the uniform microstructure, which in turn led to stable and uniform potential barriers. Also this improved technique is more feasible for producing ZnO nanopowders and resulting varistor in large scales.

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Characterization of ZnO Based Varistor Derived from Nano ZnO Powders and Ultrafine Dopants

参考文献