ON LEAD-SCANDIUM TANTALATE SOLID-SOLUTIONS WITH HIGH ELECTROCALORIC EFFECT

The PbSc0,5Ta0,5O3 solid solutions are found to be a useful material for active elements of microcryogenic devices based on electrocaloric effect. A temperature difference of DELTAT = 1.0-1.8 K at field intensities 20-30 kV/cm in the interval of 210-310 K can be achieved by simultaneous or separate introducing of Sb and Co ions in B-sites of the lattice. The most important contribution to the electrocaloric effect is due to field-induced Fm3m --> R3m phase transition in the case of high ordering of B-ions in the perovskite structure ABO3.