Microstructure and Electrical Properties of Er2O3-Doped ZnO-Based Varistor Ceramics Prepared by High-Energy Ball Milling
来源期刊：JOURNAL OF RARE EARTHS2007年第1期
论文作者：Shi Wangzhou Jiang Dongmei Kong Hui Liu Hongyu Ma Xueming
Key words：varistor; Er2O3; microstructure; electrical property; high-energy ball milling; low-temperature sintering; rare earths;
Abstract: The microstructure, electrical properties and density of ZnO-based varistor ceramics with different Er2O3 content prepared by high-energy ball milling (HEBM) and sintered at 800 ℃ were investigated. With increasing Er2O3 content, the ZnO grain size decreases due to the Er-rich phases inhibiting grain growth;and nonlinear coefficient (α) decreases because of the decrease of barrier height (φB). The breakdown voltage (Eb) and density increase, whereas leakage current (IL) decreases with increasing Er2O3 content. The barrier height (φB), donor concentration (Nd), density of interface states (Ns) decrease and barrier width (ω) increases with increasing Er2O3 content due to acceptor effect of Er2O3 in varistor ceramics.
Shi Wangzhou1，Jiang Dongmei1，Kong Hui2，Liu Hongyu3，Ma Xueming1
(1.Department of Physics, East China Normal University, Shanghai 200062, China;
2.Shanghai AJ Nano-Science Development Co., Ltd., Shanghai 200237, China;
3.College of Science, Wuhan University of Science and Technology, Wuhan 430081, China)
Abstract:The microstructure, electrical properties and density of ZnO-based varistor ceramics with different Er2O3 content prepared by high-energy ball milling (HEBM) and sintered at 800 ℃ were investigated. With increasing Er2O3 content, the ZnO grain size decreases due to the Er-rich phases inhibiting grain growth;and nonlinear coefficient (α) decreases because of the decrease of barrier height (φB). The breakdown voltage (Eb) and density increase, whereas leakage current (IL) decreases with increasing Er2O3 content. The barrier height (φB), donor concentration (Nd), density of interface states (Ns) decrease and barrier width (ω) increases with increasing Er2O3 content due to acceptor effect of Er2O3 in varistor ceramics.
Key words:varistor; Er2O3; microstructure; electrical property; high-energy ball milling; low-temperature sintering; rare earths;
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