Abstract
In this work, we consider electrocaloric (EC) device operation at high electric fields E above the temperature Tm of the maximum dielectric permittivity. Here, the EC response is determined by the temperature dependence of dielectric permittivity while dielectric losses are comparably low. We discuss materials selection and EC device concepts. An upper bound of the EC effect - independent on phase transition - is proposed which is based on the maximum energy density storable in a dielectric. Relaxors promising for EC applications are discussed.
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