Effect of Dy2O3 addition on microstructure, electrical properties, and aging behavior of ZnO-V2O5-MnO2-CoO varistor ceramics

被引：7

作者：

Nahm, Choon-W. ^{[1
]}

机构：

[1] Dong Eui Univ, Dept Elect Engn, Semicond Ceram Lab, Pusan 614714, South Korea

来源：

JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS | 2011年 / 22卷 / 11期

关键词：

SINTERED ZNO-V2O5 VARISTORS; ZINC-OXIDE VARISTORS; NONLINEAR PROPERTIES; STABILITY;

D O I：

10.1007/s10854-011-0344-7

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The microstructure, electrical properties, and aging behavior of ZnO-V2O5-MnO2-CoO-Dy2O3 varistor ceramics were investigated for different contents of Dy2O3. The microstructure consisted of ZnO grain as a main phase and secondary phases such as Zn-3(VO4)(2), ZnV2O4, and DyVO4. The average grain size increased from 7.6 to 10.1 mu m and the sintered density slightly increased from 5.53 to 5.57 g/cm(3) with the increase of Dy2O3 content. The varistor ceramics added with 0.05 mol% Dy2O3 exhibited the most nonlinear properties, with nonlinear coefficient of 30, and the highest stability against DC-accelerated aging stress. The Dy2O3 acted as an acceptor due to the decrease of donor density in the range of 2.73 x 10(18)/cm(3) to 1.28 x 10(18)/cm(3).

引用

页码：1674 / 1680

页数：7

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