Accelerated and conventional development of magnetic high entropy alloys

Structural, magnetic and magnetocaloric properties of Mn2-xCrxSb compounds have been studied. In these compounds a first order magnetic phase transition from the ferrimagnetic to the antiferromagnetic state occurs with decreasing temperature, giving rise to giant inverse magnetocaloric effects that can be tuned over a wide temperature interval through changes in substitution concentration. Entropy changes as high as 7.5 J/kgK have been observed, and a composition independent entropy change is obtained for several different concentrations/working temperatures, making these compounds suitable candidates for a composite working material.

Tuning the giant inverse magnetocaloric effect in Mn2-xCrxSb compounds

Giant magnetocaloric effect in the antiferromagnet GdScO3 single crystal

Magnetostructural transitions with a critical behavior in Y-doped MnCoGe compounds

In this work, the phase transitions of stoichiometric MnCoGe alloys were studied by systematically varying the annealing conditions and applying hydrostatic pressure. First-order martensitic structural transitions from the Ni 2In-type hexagonal austenite phase to the TiNiSi-type orthorhombic martensite phase spanned a wide temperature window ( > 200 K) as a result of quenching the samples at temperatures ranging from the solid phase at 700  ° C to the liquid phase at 1150 ° C. Despite the large variation in their structural transition temperatures, the changes in cell parameters across the structural transitions and the Curie–Weiss temperatures of the martensite/austenite phase were relatively small. For the sample quenched from 800 ° C, coupled magnetostructural transitions were observed, and the largest maximum magnetic entropy change was found to be − Δ S m a x = 33.6 J/kg K for a 7-T field change. The coupled magnetostructural transitions and the corresponding magnetic entropy enhancements were found to also be achievable by applying hydrostatic pressures. Meanwhile, as the quenching temperatures or hydrostatic pressures increased, the first-order martensitic structural transition shifted toward lower temperature until it was ultimately absent, in which case only the crystal structure and magnetic transition of the Ni 2In-type hexagonal austenite phase were present.

The influence of hydrostatic pressure and annealing conditions on the magnetostructural transitions in MnCoGe

Comparative phase transformation and magnetocaloric effect study of Co and Mn substitution by Cu in MnCoGe compounds

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Comparative phase transformation and magnetocaloric effect study of Co and Mn substitution by Cu in MnCoGe compounds