Abstract
The paper provides a theoretical framework for the description of the multicaloric effect in a multiphase structure occupying a finite volume and bounded by some surface. By means of the total energy variation we can determine the electric and elastic fields, entropy, and heat capacity. The multicaloric effect can be partitioned into volumetric and surface contributions. The volumetric effect is divided into primary, secondary and tertiary. The secondary effect is caused by the interaction of the fields and the tertiary by gradient effects. As the size of the sample decreases, the contributions of both the surface part and the tertiary effect to the total multicaloric effect increase.
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