Electrically driven thermal changes in PbSc0.5Ta0.5O3 bulk ceramics are investigated using temperature and electric-field dependent differential scanning calorimetry and infrared thermometry. On first application and removal of electric field, we find asymmetries in the magnitude of isothermal entropy change $Delta$ S and adiabatic temperature change $Delta$ T, due to hysteresis. On subsequent field cycling, we find further asymmetries in the magnitude of $Delta$ T due to non-linearity in the isofield legs of entropy-temperature plots.
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