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Microstructure and Electrical Properties of La2O3-Doped ZnO-Bi2O3 Based Varistor Ceramics

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Abstract:

La2O3-doped ZnO-Bi2O3-based varistor ceramics were obtained by a solid reaction route, and the microstructure and electrical properties of the varistor ceramics were studied in this paper. The results showed with addition of 0-1.00mol% La2O3, La2O3-doped ZnO-based varistor ceramics were prepared in this paper with the voltage gradient of 77-503V/mm, the nonlinear coefficient of 2.4-36.8, and the leakage current of 0.09-494μA. The results also showed with addition of 0.08mol% La2O3, La2O3-doped ZnO-based varistor ceramics exhibit comparatively ideal comprehensive electrical properties. Such as the threshold voltage was 320V/mm, the nonlinear coefficient was 36.8 and the leakage current was 0.29μA. The doping of La2O3 affects the form and decomposition of the pyrochlore.

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Periodical:

Advanced Materials Research (Volumes 79-82)

Pages:

2007-2010

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.79-82.2007

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Online since:

August 2009

Authors:

Dong Xu, Xiao Nong Cheng, Ming Song Wang, Li Yi Shi

Keywords:

Electrical Properties, Microstructure, Rare Earth (RE), Varistor, Zinc Oxide (ZnO)

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