On the parameters for electrocaloric effect predicted by indirect method

摘要

The influences of specific heat capacity CP,temperature step ΔT,electric field step ΔE,and initial electric field E1 on predicted electrocaloric (EC) temperature ΔT of monodomain BaTiO3 are examined by combining the Maxwell equation and phenomenological theory.Since the procedure is similar to indirect measurement of the EC effect,the results can serve as a reference for experiments.The results suggest that (i) it is reasonable to use zero-field CP,(ii) optimized ΔT should be 2 K,(iii) it is better to keep ΔE ＜ EC,and (iv) E1 ＜ Ec.Here,Ec is the coercive field of material.