Effect of chemical element doping and sintering atmosphere on the microwave dielectric properties of barium zinc tantalates

J. S. Kim, J. W. Kim, C. I. Cheon, Y. S. Kim, S. Nahm, J. D. Byun

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

The microwave dielectric properties, long range ordering (LRO) of Zn/Ta sites, and extra phase formation were studied in Ba(Zn1/3 Ta2/3)O3 ceramics doped with 0-4 mol% BaWO4 under varying sintering conditions. The sintering atmosphere was either air or ZnO-powder muffling. The LRO were analyzed by Rietveld refinement method using X-ray diffraction data. The Q.f values were extremely low for samples prepared under ZnO-muffling regardless of the degrees of LRO. Maximum Q.f values were 160,000-200,000 GHz at 0.5-1.5 mol% BaWO4 doping. The extra phases formed during sintering in air and under ZnO-muffling were analyzed in detail. The air sintered specimens showed Ba7Ta6O22 as a major extra phase accompanied by ZnO-loss; in ZnO-muffled specimens BaWO4 was a dominant extra phase. During the ZnO-loss process point defects in the Zn/O sites could be introduced into BZT.

Original languageEnglish
Pages (from-to)2599-2604
Number of pages6
JournalJournal of the European Ceramic Society
Volume21
Issue number15
DOIs
Publication statusPublished - 2001

Keywords

  • BZT
  • Cation ordering
  • Extra phase
  • Loss quality
  • ZnO-loss

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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