Direct synthesis of varistor-grade doped nanocrystalline ZnO and its densification through a step-sintering technique

S. Anas, R. V. Mangalaraja, Mukundan Poothayal, Sanjeev K. Shukla, S. Ananthakumar

Research output: Contribution to journalArticlepeer-review

68 Scopus citations

Abstract

A direct synthesis of varistor-grade doped ZnO powder was attempted by simple hydrolysis followed by low-temperature refluxing (80 °C) in aqueous and alcoholic media. Rod like, one-dimensional nanocrystalline doped ZnO powders with crystallite size 24 nm and Brunauer-Emmett-Teller (BET) bulk surface area 22 m2 g-1 were synthesized. Sintering characteristics of these powders were analyzed under step-sintering coupled with rapid heating up to 1050 °C. The microstructural features and I-V characteristics of the step-sintered doped ZnO were compared with composite varistors. The study shows the advantage of the addition of nanosize doped varistor-grade ZnO as well as step-sintering for controlling grain size and improving varistor performance.

Original languageEnglish
Pages (from-to)5792-5801
Number of pages10
JournalActa Materialia
Volume55
Issue number17
DOIs
StatePublished - Oct 2007
Externally publishedYes

Keywords

  • Composite varistors
  • Direct synthesis
  • Doped zinc oxide
  • Reflux
  • Step-sintering

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