Microwave Sintering and Dielectric Properties of BaTiO3 Ceramics-Effect of liquid phase

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  • Nishimura Yutsuki
    National Institute of Advanced Industrial Science and Technology (AIST)
  • Yasuoka Masaki
    National Institute of Advanced Industrial Science and Technology (AIST)
  • Nagaoka Takaaki
    National Institute of Advanced Industrial Science and Technology (AIST)
  • Kinemuchi Yoshiaki
    National Institute of Advanced Industrial Science and Technology (AIST)
  • Watari Koji
    National Institute of Advanced Industrial Science and Technology (AIST)

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  • ＢａＴｉＯ３セラミックスのマイクロ波焼成とその焼結体の電気的特性―液相の影響
  • BaTiO3 セラミックス ノ マイクロハ ショウセイ ト ソノ ショウケツタイ ノ デンキテキ トクセイ エキソウ ノ エイキョウ

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Effects of liquid phase on microwave sintering with a frequency of 2.45 GHz of BaTiO3 ceramics were investigated. The additives to form the liquid were BaCO3, H3BO3 and BaB2O4. Addition of the liquid phase in microwave sintering promotes densification of BaTiO3 ceramics significantly, and densified ceramics were obtained by lower applied power and shorter processing time. Furthermore, electric resistivity of dense ceramics with BaCO3+2H3BO3 addition was different by sintering techniques, and a sample obtained by microwave sintering showed the dielectric, while one obtained by conventional sintering showed the semiconducting properties. Such different result is considered to be relating to presence of liquid phase with strong microwave absorption.

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