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 (∼0.6 µm), compared with the undoped specimen (∼1.5 µm). 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°C) and the temperature coefficient of capacitance curves satisfied the X8R requirements above 3 mol% Y2O3.
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Song et al. (2005) studied this question.
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