Dielectric properties of Yb2O3-doped barium strontium calcium titanate thick films for microwave device applications

(Ba 0.56 Sr 0.34 Ca 0.10 )TiO 3 (BSCT) thick films doped with 0.1 mol% MnCO 3 and Yb 2 O 3 (0.1–0.7 mol%) were fabricated by the screen-printing method on the alumina substrate. The structural and electrical properties as a function of Yb 2 O 3 amount were investigated. All BSCT thick films showed the formation of a complete solid solution in a cubic perovskite polycrystalline structure. Average grain size of the specimen doped with 0.7 mol% Yb 2 O 3 was about 2.7 μm. The thickness of all BSCT thick films was approximately 50–55 μm. The relative dielectric constant, dielectric loss, and tunability of the BSCT thick films doped with 0.3 mol% Yb 2 O 3 were 2,966, 0.7, and 14.3%, respectively.