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(Ba0.9-xSrxCa0.10)TiO3 (x=0.33, 0.36) powders were prepared by sol-gel method. (Ba,Sr,Ca)TiO3 (BSCT) thick films, undoped and doped with MnCO3 and Yb2O3 (0.1~0.7 mol%), were fabricated by the screen printing method on the alumina substrate. The coating and drying procedure was repeated 6-times. The Pt bottom electrode was screen printing method on the alumina substrate. These BSCT thick films were annealed at 1420 oC for 2 hr in atmosphere. The upper electrodes were fabricated by screen printing the Ag paste and then firing at 590 oC for 10 min. And then the structured and dielectric properties as a function of the doping amount of Yb2O3 were studied. As a result of the TG-DTA, exothermic peak was observed at around 670 oC due to the formation of the polycrystalline perovskite phase. All BSCT thick films showed XRD patterns of typical cubic peroveskite structure. The average thickness of BSCT thick films was about 70 mm. The curie temperature and the dielectric constant decreased with increasing Yb2O3 doped content and the relative dielectric constant of the specimen, doped with 0.5 mol% Yb2O3 at BSCT(54/36/10), showed a best value of 5018 at curie temperature.

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