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http://dx.doi.org/10.4313/TEEM.2011.12.5.213

Impulse Degradation Behavior of ZPCCYE Varistors with Y2O3/Er2O3 Ratio  

Nahm, Choon-Woo (Semiconductor Ceramics Laboratory, Department of Electrical Engineering, Dongeui University)
Park, Jong-Hyuk (Semiconductor Ceramics Laboratory, Department of Electrical Engineering, Dongeui University)
Publication Information
Transactions on Electrical and Electronic Materials / v.12, no.5, 2011 , pp. 213-217 More about this Journal
Abstract
The nonlinear electrical properties and degradation behavior against an impulse-current of 400 A in the ZnO-$Pr_6O_{11}$-CoO-$Cr_2O_3$-$Y_2O_3$-$Er_2O_3$ (ZPCCYE) varistors were investigated with different $Y_2O_3/Er_2O_3$ ratios. The $Y_2O_3/Er_2O_3$ mole ratio has a significant effect on nonlinear electrical properties and impulse degradation behavior of the ZPCCYE varistors. The varistors added with $Y_2O_3/Er_2O_3$ = 0.5/0.5 exhibited the best nonlinear properties with 39 in nonlinear coefficient (${\alpha}$) and the best clamp characteristics, in which the clamping voltage ratio (K) was in the range of K = 1.62-2.18 at an impulse-current of 1-50 A. The varistors added with $Y_2O_3/Er_2O_3$ = 0.25/0.5 exhibited the best electrical stability, with $%{\Delta}E_{1mA/cm^2}$=-5.6%, $%{\Delta}{\alpha}$ = 6.7%, and $%{\Delta}J_L$ = -14.6% against an impulse-current of 400 A. On the contrary, the varistors added with $Y_2O_3/Er_2O_3$ = 0.5/0.5 were destroyed applying an impulse-current of 400 A.
Keywords
Ceramics; Nonlinear electrical properties; Impulse degradation behavior; Varistors;
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