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Microstructure and nonohmic properties of binary ZnO-V2O5ceramics sintered at 900 °C

Authors
Journal
Materials Letters
0167-577X
Publisher
Elsevier
Publication Date
Volume
26
Issue
3
Identifiers
DOI: 10.1016/0167-577x(95)00217-0
Keywords
  • Zno
  • V2O5Doping
  • Varistor
  • Nonohmic Property
  • Microstructure
  • Abnormal Grain Growth

Abstract

Abstract The microstructure and nonlinear current-voltage characteristics of ZnO-V 2O 5 ceramics sintered at 900 °C were investigated. V 2O 5 was the only additive used and the amount ranged from 0.25 to 2 mol%. According to our microstructural observations, a change of grain-growth mechanism occurred from the isotropic growth behavior of pure ZnO to the abnormal growth after doping with V 2O 5. This was attributed to the sintering of ZnO grains in the presence of a V 2O 5-rich liquid phase. The zinc oxide ceramics doped with V 2O 5 exhibited nonohmic behavior. The nonlinear characteristics of these binary ceramics were strongly dependent on the V 2O 5 content and the microstructure.

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