[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.4313/TEEM.2007.8.6.234

Influence of Dy Doping on Electrical Properties and dc Aging Behaviors of Zn-Pr-Co-Cr System

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

Publication Information

Transactions on Electrical and Electronic Materials / v.8, no.6, 2007 , pp. 234-240 More about this Journal

Abstract

The electrical properties and dc aging behavior for specified stress state of system, which is composed of quaternary Zn-Pr-Co-Cr, were investigated for different $Dy_2O_3$ addition doping level. As $Dy_2O_3$ doping level increased, the density decreased in the range of 5.51-4.90 $g/cm^3$ , reaching maximum at 0.5 mol% and the average ZnO grain size decreased in the range of 17.7-6.0 ${\mu}m$ . The incorporation of $Dy_2O_3$ significantly improved the non-ohmic properties, above 30 in non-ohmic coefficient, compared with that of undoped samples. The samples with the best performance of non-ohmic properties were obtained for $Dy_2O_3$ doping level of 1.0 mol%, with 49 in non-ohmic coefficient and 2.6 ${\mu}A/cm^2$ in leakage current. The samples with the highest stability were obtained for $Dy_2O_3$ doping level of 0.5 mol%.

Keywords

Microstructure; Electrical properties; Varistors; $Pr_6O_{11}; Dy_2O_3$ ;

Citations & Related Records

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