(Ba0.6Sr0.3Ca0.1)TiO3 powders, prepared by the sol-gel method, were mixed organic binder and the BSCT thick films were fabricated by the screen printing techniques on alumina substrates. The structural and pyroelectric properties were investigated with variation of Pr2O3 contents. All BSCT thick films, sintered at 1420 oC, showed the typical XRD patterns of a cubic perovskite polycrystalline structure. The average grain size of the thick film doped with 0.1 mol% Pr2O3 is 2.4 μm and the thickness of all BSCT specimens was about 50 μm. Relative dielectric constant and dielectric loss of the thick film doped with 0.1 mol% Pr2O3 were 4714 and 5.9%, respectively. All BSCT thick films showed the maximum pyroelectric coefficient at around the Curie temperature, and the specimen doped with 0.1 mol% Pr2O3 showed the highest value of 65.3×10−9 C/cm2K. The figure of merit F.M.D* for specific detectivity of the specimen, doped with 0.5 mol% Pr2O3, showed the good values lager than 1.0×10−9 Ccm/J at around room temperature.

Keywords: BaTiO3, Pyroelectric properties, Thick film, Screen-printing, IR detector.