Journal
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS
Volume 43, Issue 8A, Pages 5373-5377Publisher
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/JJAP.43.5373
Keywords
MgO; BaTiO3; degradation; oxygen vacancy; MLCC
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Degradation behaviors of Mg-doped BaTiO3 have been studied in terms of oxygen vacancy concentration and microstructural development. Mg-doped BaTiO3 powders were precisely synthesized by the Pechini method. As MgO content was increased to 1.0 mol%, Curie points moved to lower temperatures and dielectric constants decreased. The specimens doped with MgO showed higher leakage currents under the continuously applied dc field at a high temperature (100degreesC) during the aging process, compared with the undoped BaTiO3. With low levels of MgO (< 1.0 mol%), the microstructure is similar to that of undoped BaTiO3, whereas a significant reduction in grain size was observed with higher levels (>2.0 mol%).
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