Effect of B2O3 additives on sintering and microwave dielectric behaviors of 0.66Ca(Mg1/3Nb2/3)O3-0.34CaTiO3 ceramics

Cheng Liang Huang, Jun Jie Wang, Bing Jing Li, Wen Chang Lee

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38 Citations (Scopus)

Abstract

The effects of B2O3 additives on the microstructures and the microwave dielectric properties of complex perovskite 0.66Ca(Mg1/3Nb2/3)O3-0.34CaTiO3 ceramics were investigated. The B2O3 additives, acting as a sintering aid, can effectively lower the sintering temperature of the ceramics to as low as 1200 °C. No second phase was observed throughout the entire experiments. Moreover, boron was not found in the grains but residual at the boundaries indicating a liquid phase sintering. At 1250 °C, the 0.25 wt% B2O3-doped 0.66Ca(Mg1/3Nb2/3)O3-0.34CaTiO3 ceramics possesses a relative permittivity εr of 43.94, a Q × f value of 30,000 GHz (measured at 6.7 GHz) and a τf value of -1.9 ppm/°C. It exhibits a substantial temperature reduction (>200 °C) and compatible dielectric properties in comparison with that of un-doped one.

Original languageEnglish
Pages (from-to)440-446
Number of pages7
JournalJournal of Alloys and Compounds
Volume461
Issue number1-2
DOIs
Publication statusPublished - 2008 Aug 11

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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