We investigated the relation between the temperature of the maximum electrocaloric temperature change deltaTEC (TEC max) and the temperature of the permittivity peak (Tm) as a function of the electric field (E) in PbMg1/3Nb2/3O3-PbTiO3 (PMN-PT, PT in the amount of max. 10 mole %) bulk ceramics. Both maxima, ?deltaTEC and TEC max, increase with increasing PT content at a given field. Since the TEC max is always lower than Tm and the temperature gap between both maxima progressively increases with increasing DC bias, the Tm cannot be used as the estimation of the TEC max. In contrast, Tm can only roughly mark the temperature of the upper boundary of the temperature-electric-field window where the EC responsivity is the highest.
COBISS.SI-ID: 14687491