Influence of sintering on microstructure and electrical properties of ZnO-based multilayer varistor (MLV)

Wen-Shi Lee, W. T. Chen, Y. C. Lee, Tony Yang, C. Y. Su, C. L. Hu

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15 Citations (Scopus)

Abstract

The effect of sintering on microstructure, dielectric property and varistor property of ZnO-based multilayer varistor (MLV) were investigated. The results show that an optimum microstructure of ZnO-based MLV can be obtained when sintering at 950 °C/1.5 h. The reaction between ZnO and Sb2O3 is noted. Also, the segregation of Bi2O3 to the inner electrode and thus the reaction of Bi2O3 with Pd are observed. The VB and α value of ZnO-based MLV can be controlled in a straightforward manner through the control of grain size. The decrease in VB directly relates to the grain growth of ZnO grains when increasing the sintering temperatures from 900 to 1050 °C. Moreover, the increase of capacitance with sintering temperature may mainly result from the coalescence of ZnO matrix grains. The energy absorption capabilities in terms of electro-static discharge (ESD) and peak current (PC) measurements of ZnO-based MLV are reported. The optimum varistor properties of ZnO-based MLV can be obtained when sintering at 950 °C.

Original languageEnglish
Pages (from-to)1001-1005
Number of pages5
JournalCeramics International
Volume33
Issue number6
DOIs
Publication statusPublished - 2007 Aug 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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