Aqueous Precipitation of Spherical Zinc Oxide Powders for Varistor Applications

Sossina M. Haile*, David W. Johnson, Gary H. Wiseman, H. Kent Bowen

*Corresponding author for this work

Research output: Contribution to journalArticle

109 Scopus citations

Abstract

Aqueous precipitation has been used to prepare spherical ZnO particles. These powders have been shown to be suitable for use in the preparation of varistors. The uniform size distribution and uniform coating of these powders with the appropriate dopants allowed fabrication of varistors with improved properties over those fabricated from conventionally ball‐milled and calcined powders. The improved properties were a high coefficient of nonlinearity (∼44) in the nonohmic region, a sharp change in electrical behavior from ohmic to nonohmic, and a high resistivity (5×1012 SOM°m) at low voltages.

Original languageEnglish (US)
Pages (from-to)2004-2008
Number of pages5
JournalJournal of the American Ceramic Society
Volume72
Issue number10
DOIs
StatePublished - Jan 1 1989

Keywords

  • colloids
  • dopants
  • powders
  • varistors
  • zinc oxide

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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