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Microstructure and electrical properties of Y(NO3)3·6H2O-doped ZnO-Bi2O3-based varistor ceramics |
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| Authors: | Dong Xu Xiaonong ChengHongming Yuan Juan YangYuanhua Lin |
| Affiliation: | a School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, PR China b Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, PR China c State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, PR China d State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, PR China e State Key Laboratory of New Ceramic and Fine Processing (Tsinghua University), Beijing 100083, PR China |
| Abstract: | Y(NO3)3·6H2O-doped ZnO-Bi2O3-based varistor ceramics were prepared using a solid reaction route. The microstructure, electrical properties, degradation coefficient (DV), and dielectric characteristics of varistor ceramics were studied in this paper. With increasing amounts of Y(NO3)3·6H2O in the starting composition, Y-containing Bi-rich, Y2O3, and Sb2O4 phases were formed, and the average grain size decreased. Results also showed that with the addition of 0.16 mol% Y(NO3)3·6H2O, Y(NO3)3·6H2O -doped ZnO-based varistor ceramics exhibit comparatively better comprehensive electrical properties, such as a threshold voltage of 425 V/mm, a nonlinear coefficient of 73.9, a leakage current of 1.78 μA, and a degradation coefficient of 1.7. The dielectric characteristics and lightning surge test also received the same additional content of Y(NO3)3·6H2O. The results confirmed that doping with rare earth nitrates instead of rare earth oxides is very promising route in preparing high-performance ZnO-Bi2O3-based varistor ceramics. |
| Keywords: | Ceramics Varistors Rare earth alloys and compounds Microstructure Electrical properties |
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