ユーロピウム添加チタン酸バリウムセラミックスの構造と誘電特性

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  • Structure and Dielectric Properties of Eu-Doped Barium Titanate Ceramics
  • Structure and Dielectric Properties of Eu-Doped Barium Titanate Ceramics鈴木秀茂・

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Eu-doped BaTiO3 ceramics (EBT) were prepared by the cold-pressing ceramic process on the basis of the formula Ba1-xEuxTi1-x/8O3 (x=0.01-0.05, 0.10). The effects of Eu doping on the structure, microstructure, dielectric and ferroelectric properties of BaTiO3 ceramics were studied. EBT ceramics have a high density, a low porosity and a fine grain size of 0.7-1.0 μm. As x≤3%, EBT ceramics have a tetragonal perovskite structure. The Curie point decreases linearly at a rate of -11°C/mol% Eu ions with increasing Eu content up to 0.04. However, at x≥0.04, a secondary phase, Eu2Ti2O7, occurs and increases in concentration with increasing Eu, the Curie point remaining constant. The room-temperature dielectric constant of EBT ceramics (ε′RT=1600-3100) shows a temperature-independent dielectric region below 50°C at x≥0.04, a frequency stability below 106 Hz and good ageing resistance behavior.<br>

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