Microstructure and Characteristics of Ba(Ti,Zr)O_3 Ceramics with Addition of Glass Frit

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Microstructure and characteristics of Ba(Ti,Zr)O_3 ceramics are significantly influenced by the addition of 4PbO.B_2 O_3. The melting temperature of 4PbO.B_2O_3 was approximately 500℃, and thus it provides a liquid phase during sintering. At low sintering temperatures, the grain growth of Ba(Ti,Zr) O_3 ceramics is enhanced by capillary rearrangement and solution-reprecipitation from the liquid phase. At high sintering temperatures, exaggerated grain growth of Ba(Ti,Zr) O_3 ceramics is restrained by the presence of a liquid phase. The spreading liquid can penetrate the solid-solid interfaces. Penetration leads to disintegration of the solid and the subsequent rearrangement of fragments. With increasing amounts of 4PbO.B_2O_3, the tetragonal c/a ratio and Curie point temperature increase, but the dielectric loss tangent is depressed. With a suitable amount of glass ft-it and temperature for sintering, the density is enhanced and the values of the planar coupling factor and the poled dielectric constant are improved.
社団法人応用物理学会の論文
2002-08-15