The magnetocaloric properties of the systems exhibiting magnetic (paramagnetism (PM)–ferromagnetism (FM)) and structural (hexagonal lattice–orthorhombic lattice) transitions separated (overlapped) in temperature are analyzed in terms of a model of interacting parameters of magnetic and structural orders. It is shown that the magnetocaloric characteristics of the system can increase or decrease during overlapping of the structural ( P 6 3 / mmc – P nma ) and magnetic (PM–FM) transitions in the dependence of the character of combination of the low-symmetric orthorhombic ( P nma ) and high-symmetric hexagonal ( P 6 3 / mmc ) phases with a ferromagnetic order.
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Вальков et al. (2018) studied this question.
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