The Influence of Li on the Point Defect Structure of ZnO Varistor Ceramics

Abstract:

In this paper, the dielectric properties of ZnO-Bi₂O₃ based varistor ceramics doped with Li are investigated by Novocontrol wide band dielectric spectrometer. It is found that Lithium is an amphoteric impurity. If the content of Lithium is very low, It will enters into the interstitials and Lithium interstitial is formed as a donor. While with the increase of Lithium content, Zn is replaced with Li and Lithium substitution for Zinc as a acceptor is formed. If the content of Lithium increases further, Lithium interstitial is formed again with the redundant Lithium. Therefore, the concentrations of intrinsic point defects of Zinc interstitial and oxygen vacancy varies with the content of Lithium, which leads to the increase of Schottky barrier at grainboundary with Lithium.

• Periodical: Advanced Materials Research (Volumes 1004-1005)
• Pages: 424-428
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1004-1005.424
• Online since: August 2014
• Authors: Lei Zhao*, Peng Fei Cheng
• Keywords: Dielectric Spectroscopy, Intrinsic Point Defects, Li Doping, ZnO Varistor Ceramics

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