Influence of V2O5 additions to Ba(Mg 1/3Ta2/3)O3 ceramics on sintering behavior and microwave dielectric properties

Cheng Liang Huang, Kuo Hau Chiang, She Cher Chuang

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19 Citations (Scopus)

Abstract

The microstructures and the microwave dielectric properties of barium magnesium tantalate ceramics prepared by conventional mixed oxide route have been investigated. The prepared Ba(Mg1/3Ta2/3)O 3 exhibited a mixture of cubic perovskite and a hexagonal superstructure with Mg and Ta showing 1:2 order in the B-site. It is found that low level doping of V2O5 (up to 0.5wt.%) can significantly improve densification of the specimens and their microwave dielectric properties. The density of doped Ba(Mg1/3Ta 2/3)O3 ceramics can be increased beyond 95% of its theoretical value by 1500°C-sintering, which is caused by the liquid-phase effect of V2O5 addition. The detected second phase Ta 2O5 was mainly the result of V5+ substitution in the ceramics. Dielectric constant (εr) and temperature coefficient of resonant frequency (τf) were not significantly affected, while the unloaded quality factors Q were effectively promoted by V2O5 addition due to the increase in B-site ordering. The εr value of 24.1, Q × f value of 149,000 (at 10GHz) and τf value of 7.2ppm/°C were obtained for Ba(Mg 1/3Ta2/3)O3 ceramics with 0.25wt.% V 2O5 addition sintered at 1500°C for 3h.

Original languageEnglish
Pages (from-to)629-636
Number of pages8
JournalMaterials Research Bulletin
Volume39
Issue number4-5
DOIs
Publication statusPublished - 2004 Apr 2

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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