Dielectric and Pyroelectric Properties of Y-doped Ba0.6Sr0.3Ca0.1TiO3 Ceramics by Solid-state Reaction Technique

(Ba0.6Sr0.3Ca0.1)(1-x)YxTi0.999Mn0.001O3(0 <= x <= 0.007) ceramics were prepared by the solid-state reaction technique. The effects of Y doping on the microstructure, dielectric properties and pyroelectric properties were investigated. The average grain size decreases with the increase of Y concentration. The dielectric and pyroelectric properties measurement results show that the dielectric constant, dielectric loss, T-c and pyroelectric coefficient all initially increase and then decrease with Y concentration. And the pyroelectric figure of merit F-d can be improved by the Y doping. The specimen doped with 0.7mol%Y shows a higher maximum F-d value of 8.22x10(-5) Pa-1/2 under 700 V/mm near 30 degrees C with the smallest average grain size of 3.1 mu m, indicating its promising application in infrared thermal imaging arrays devices.