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http://dx.doi.org/10.4313/TEEM.2006.7.4.189

Electrical and Dielectric Properties, and Accelerated Aging Characteristics of Lanthania Doped Zinc Oxide Varistors

Nahm, Choon-Woo (Department of Electrical Engineering, Dongeui University)

Publication Information

Transactions on Electrical and Electronic Materials / v.7, no.4, 2006 , pp. 189-195 More about this Journal

Abstract

The microstructure, electrical and dielectric properties, and stability against DC accelerated aging stress of the varistors, which are composed of quaternary system $ZnO-Pr_6O_{11}CoO-Cr_2O_3-based$ ceramics, were investigated for different $La_2O_3$ contents. The increase of $La_2O_3$ content led to more densified ceramics, whereas abruptly decreased the nonlinear properties by incorporating beyond 1.0mol%. The highest nonlinearity was obtained from 0.5mol% $La_2O_3$ , with the nonlinear coefficient of 81.6 and the leakage current of $0.1{\mu}A$ . The varistors doped with 0.5mol% $La_2O_3$ exhibited high stability, in which the variation rates of breakdown voltage, nonlinear coefficient, leakage current, dielectric constant, and dissipation factor were -1.1%, -3.7%, +100%, +1.4%, and +8.2%, respectively, for stressing state of $0.95V_{1mA}/150^{\circ}C/24h$ .

Keywords

Microstructure; $Pr_6O_{11}$ ; $La_2O_3$ ; Electrical properties; Varistors; Stability;

Citations & Related Records

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