A comprehensive thermodynamic model for temperature change in i-caloric effects

TL;DR

This paper introduces a comprehensive thermodynamic model that accurately determines adiabatic temperature change in i-caloric materials from non-adiabatic measurements, aiding the development of solid-state cooling technologies.

Contribution

The work presents a novel thermodynamic model that correlates non-adiabatic temperature measurements with adiabatic temperature change in i-caloric effects, applicable to different materials.

Findings

Model fits temperature vs. time data well.

Model accurately predicts $T_{S}$ from non-adiabatic data.

Applicable to various i-caloric materials.

Abstract

Solid-state cooling based on i-caloric effects may be an alternative to conventional vapor-compression refrigeration systems. The adiabatic temperature change ($\Delta T_{S}$) is one of the parameters that characterize the i-caloric effects, therefore it is important to obtain the correct $\Delta T_{S}$ values and, whenever possible, to correlate this parameter with thermodynamic and microscopic quantities. In this work, we propose a comprehensive thermodynamic model that allows us to determine the adiabatic temperature change from non-adiabatic measurements of temperature change induced by a field change. Our model fits efficiently temperature versus time and temperature change versus the inverse of the field change rate data for three different materials presenting different i-caloric effects. The results indicate the present model is a very useful and robust tool to obtain the correct $\Delta T_{S}$ values and to correlate $\Delta T_{S}$ with other thermodynamic quantities.