Abstract
(Ba,Sr,Ca)TiO 3 powders, prepared by the sol–gel method, were mixed with an organic vehicle and the BSCT thick films were fabricated by the screen-printing techniques on alumina substrates. All the BSCT thick films, sintered at 1420 °C, showed the typical XRD patterns of a perovskite polycrystalline structure. The average grain size decreased with increasing amounts of MnO 2, and the BSCT(50/40/10) thick film doped with 1 wt.% MnO 2 showed a value of 6.5 μm. The thickness of thick films by four-cycle on printing/drying was approximately 100 μm. The Curie temperature and the relative dielectric constant decreased with increasing Ca content and MnO 2 doping amount. The relative dielectric constant, dielectric loss and tunability of the BSCT(50/40/10) thick films doped with 1.0 wt.% MnO 2 were 1296%, 0.61% and 11.18%, respectively.
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