Microstructure and electrical properties of Lu₂O₃-doped ZnO-Bi₂O₃-based varistor ceramics

来源期刊：中国有色金属学报(英文版)2010年第12期

论文作者：徐东 史小锋 程晓农 杨娟 樊曰娥 袁宏明 施利毅

文章页码：2303 - 2308

Key words：ZnO-Bi₂O₃ ceramics; varistor; rare earth; electrical properties

Abstract: Lu₂O₃-doped ZnO-Bi₂O₃-based varistor ceramics samples were prepared by a conventional mixed oxide route and sintered at temperatures in the range of 900-1 000 °C, and the microstructures of the varistor ceramics samples were characterized by X-ray diffractometry (XRD) and scanning electron microscopy (SEM); at the same time, the electrical properties and V—I characteristics of the varistor ceramics samples were investigated by a DC parameter instrument for varistors. The results show that the ZnO-Bi₂O₃-based varistor ceramics with 0.3% Lu₂O₃ (molar fraction) sintered at 950 °C exhibit comparatively ideal comprehensive electrical properties. The XRD analysis of the samples shows the presence of ZnO, Bi-rich, spinel Zn₇Sb₂O₁₂ and Lu₂O₃-based phases.