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Low-field magnetocaloric effect in Nd2Ni2ln intermetallic compound / Efeito magnetocalórico de baixo campo no composto intermetálico Nd2Ni2ln

2021; Brazilian Journal of Development; Volume: 7; Issue: 12 Linguagem: Inglês

10.34117/bjdv7n12-123

2525-8761

J.A. daSilva-Santos, Jeferson Marques Santos, Edison Jesus Ramirez Plaza, N. O. Moreno,

Shape Memory Alloy Transformations

In this work, we consider a model which describes the CEF and magnetic interaction applied to two sublattices, where the magnetic interaction is described by a Hamiltonian who considers the Zeeman and exchange interactions in the molecular field approximation. The isothermal magnetic entropy change ΔS as a function of temperature was computationally obtained in the [001] crystallographic direction, from the equation of state of magnetization M(H, T) and entropy S (H, T) by diagonalization of the total Hamiltonian (HTot). We obtained a good agreement between the theory and the experiment was using the estimated crystal-field parameters and the exchange integral for Nd2Ni2In.