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 language | English |
---|---|
Pages (from-to) | 2599-2604 |
Number of pages | 6 |
Journal | Journal of the European Ceramic Society |
Volume | 21 |
Issue number | 15 |
DOIs | |
Publication status | Published - 2001 |
Keywords
- BZT
- Cation ordering
- Extra phase
- Loss quality
- ZnO-loss
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry