Elsevier

Journal of Rare Earths

Volume 25, Issue 1, February 2007, Pages 120-123
Journal of Rare Earths

Microstructure and Electrical Properties of Er2O3-Doped ZnO-Based Varistor Ceramics Prepared by High-Energy Ball Milling

https://doi.org/10.1016/S1002-0721(07)60057-XGet rights and content

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 °C 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.

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Liu Hongyu (1966-), Male, Doctor, Associate professor; Research interest: functional materials

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Liu Hongyu (1966-), Male, Doctor, Associate professor; Research interest: functional materials

Foundation item: Project supported by National Natural Science Foundation of China (50471045) and Shanghai Nano-Technology Promotion Center (0452nm026)

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