Effect of Fe₂O₃ Dopant on Electronic Densities and Electrical Properties of ZnO-Based Varistors

Abstract:

The effect of the Fe₂O₃ dopant on the electronic densities and the electrical properties has been studied in a ZnO-Bi₂O₃-SnO₂-Co₂O₃-MnO₂-TiO₂-Ni₂O₃-Fe₂O₃ system by the measurements of positron lifetime spectra, coincidence Doppler broadening spectra and current-voltage characteristics. The results show that the 3d electron signal in the spectrum of the varistor increases with the Fe₂O₃ content. The addition of small amount of Fe₂O₃ into the ZnO-based varistor leads to an increase in the donor concentration in the bulk and the defects in the varistor. As the Fe₂O₃ content increased, the threshold voltage (V_T) and the nonlinear coefficient (α) of the varistor decreased monotonously.

• Periodical: Advanced Materials Research (Volumes 415-417)
• Pages: 1042-1045
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.415-417.1042
• Online since: December 2011
• Authors: Wen Deng, Zhen Quan Lei, Jiao Ling Zhao, Yan Qiong Lu, Ding Kang Xiong
• Keywords: Electronic Densities, Electronic Properties, Fe₂O₃ Dopant, ZnO-Based Varistor

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