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

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    31 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

    Bibliographical note

    Funding Information:
    This work was supported by a grant from the Korea Research Foundation in the 1999 program year. The authors deeply appreciate the support.

    Keywords

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

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Materials Chemistry

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