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JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS
Volume 44, Issue 3, Pages 1310-1313Publisher
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/JJAP.44.1310
Keywords
Y2O3; BaTiO3; X8R; grain core-grain shell; curie temperature
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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.
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