Effects of Y2O3 on temperature stability of acceptor-doped BaTiO3

Effects of Y2O3 on the temperature stability of acceptor-doped BaTiO3 dielectrics were studied. The sample doped with 1 mol% Y2O3 exhibited the highest dielectric constant. A substantial reduction in grain size was observed in the specimen with 1 mol% Y2O3 (similar to 0.6 mu m), compared with the undoped specimen (similar to 1.5 mu m). Each specimen with greater than 1 mol% Y2O3 showed a slight difference in grain size, compared with 1 mol% Y2O3. As the Y2O3 content was increased, the Curie point progressively moved to higher temperatures. The addition of Y2O3 improved the temperature dependence of the dielectric constants of the acceptor doped BaTiO3-Y2O3 system over the entire temperature range studied (-55-150 degrees C) and the temperature coefficient of capacitance curves satisfied the X8R requirements above 3 mol% Y2O3.