Observation of a Polarocaloric (Electrocaloric) Effect of 2 °C in Lead Zirconate Modified withSn4+and Ti4+

Abstract

Reported here are polarocaloric (electrocaloric) measurements of a ceramic specimen of lead zirconate modified with ${\mathrm{Ti}}^{4+}$ and ${\mathrm{Sn}}^{4+}$. Temperature changes as large as 2.0 °K were recorded. The temperature change varies roughly as the square of the polarization change. The measured effect agrees with a thermodynamic calculation which utilizes the temperature dependence of polarization versus electric field.