Dielectric properties and microstructures of Ta-doped BaTiO3–(Bi0.5Na0.5)TiO3 ceramics for X9R applications
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Ta-doped 0.90BaTiO3–0.10(Bi0.5Na0.5)TiO3 ceramics were successfully prepared by conventional solid-state reaction method and studied to satisfy super-broad temperature stability. The effects of Ta2O5 doping on the dielectric properties and microstructures were thoroughly investigated. Ta plays an important role in the formation of core–shell structure because of chemical inhomogeneity, which gives rise to the weak temperature dependence of dielectric properties. The samples with the additon of 1.5 mol% Ta2O5 satisfy the X9R specification, exhibiting an optimum dielectric behavior of ε r ~ 2100, tanδ ~ 1.6% at room temperature, which is a promising candidate material for X9R MLCC applications.
KeywordsBaTiO3 Energy Dispersive Spectroscopy Shell Structure TiO3 Ceramic Weak Temperature Dependence
The work was supported by Ministry of Sciences and Technology of China through National Basic Research Program of China (973 Program 2015CB654604), National Natural Science Foundation of China for Creative Research Groups (Grant No. 51221291), National Natural Science Foundation of China (Grant No. 51272123), and also supported by CBMI Construction Co., Ltd. Thanks Beijing National Center for Electron Microscopy for the observation of TEM.