Piezocaloric and multicaloric effect in the KH2PO4 type ferroelectrics

TL;DR

This paper investigates the piezocaloric and multicaloric effects in KH2PO4-type ferroelectrics using a modified proton ordering model, revealing that multicaloric effects surpass electrocaloric and piezocaloric effects, especially away from phase transition temperatures.

Contribution

It introduces a modified proton ordering model that accounts for dipole moment dependence on the order parameter to analyze caloric effects in ferroelectrics.

Findings

Multicaloric effect is stronger than electrocaloric and piezocaloric effects.

Multicaloric effects are especially pronounced at temperatures far from phase transition.

The model provides insights into caloric effects under shear stress and electric field.

Abstract

Using the proton ordering model modified by taking into account the dependence of the dipole moments on the order parameter [Vdovych et al, 2014], we explore the piezocaloric and multicaloric effects in the KH$_{2}$PO$_{4}$ type ferroelectrics, caused by the shear stress $\sigma_6$ and longitudinal electric field $E_3$. The multicaloric effect is shown to be stronger than either electrocaloric or piezocaloric effects, especially at temperatures far from the phase transition.