Microstructure and characteristics of BaTiO_3 ceramic with 4PbO-B_2O_3 (sintering aid)

概要

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Many lead-free materials, such as Bi-based compounds, BaTiO_3 or alkaline niobate compound, have been intensively studied. The microstructure and characteristics of BaTiO_3 ceramic are significantly influenced by addition of 4PbO-B_2O_3. Under low sintering temperatures, the grain growth of BaTiO_3 ceramic is enhanced by capillary action, rearrangement and solution-reprecipitation of the liquid phase. At high sintering temperatures, exaggerated grain growth of BaTiO_3 ceramic is restrained by the presence of a liquid phase. The glass frit also has significant effect on the dielectric and piezoelectric properties of BaTiO_3 ceramic. The measured density of BaTiO_3 ceramic with suitable addition of 4PbO-B_2O_3 glass frit and sintering temperature can get 95.7-98.8% dense. The peak value of the K^T_<33> was 2500 with addition of 0.2 mol% glass frit at the sintering of 1250℃ for 4 h. The maximum value of the k_P was 0.36 with addition of 0.2 mol% glass frit at the sintering of 1350℃ for 4 h. With suitable amounts of glass frit and an optimized sintering temperature, the density is enhanced and the values of the dielectric and piezoelectric properties are improved.
社団法人日本セラミックス協会の論文
2008-07-01