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Effect of La2O3 addition on microstructure and electrical properties of ZnO-Pr6O11-based varistor ceramics

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Abstract

The microstructure, electrical properties, and stability of the varistor ceramics, which are composed of ZnO-Pr6O11-CoO-Cr2O3-La2O3 (ZPCCL)-based ceramics, were investigated for various La2O3 contents. The increase of La2O3 content led to more densified ceramics, whereas abruptly decreased the nonlinear properties by incorporating beyond 1.0 mol%. The highest nonlinearity was obtained from 0.5 mol% La2O3, in which the nonlinear exponent is 81.6 and the leakage current is 0.1 μA. As the La2O3 content increases, the donor concentration and density of interface states were increased from 0.64×1018 to 16.89×1018/cm3 and from 2.21×1012 to 5.16×1012/cm2, respectively. However, the barrier height greatly decreased with increasing La2O3 content, reaching a maximum (1.47 eV) for 0.5 mol% La2O3.

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  1. Department of Electrical Engineering, Dongeui University, Busan, 614-714, Korea

    Choon-Woo Nahm

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  1. Choon-Woo Nahm
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Nahm, CW. Effect of La2O3 addition on microstructure and electrical properties of ZnO-Pr6O11-based varistor ceramics. J Mater Sci: Mater Electron 16, 345–349 (2005). https://doi.org/10.1007/s10854-005-1145-7

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  • DOI: https://doi.org/10.1007/s10854-005-1145-7

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