Abstract
The magnetocaloric effects in Sn-substituted Mn2Sb1-xSnx system (x = 0.1, 0.2, 0.3) have been studied. With more Sn content, metamagnetic phase transition temperature (Tt) is increased with gradually reduced Curie temperature, thermal hysteresis and the maximum of magnetic entropy change (ΔSmax). By hydrostatic pressure of 2.5 kbar, Tt is lowered but ΔSmax is enhanced from 4.2 JKg−1K−1 to ∼5.5 Jkg−1K−1 in Mn2Sb1-xSnx (x = 0.1, 0.2) ingots. The uniaxial magnetocrystalline anisotropy is found in all Mn2Sb1-xSnx ingots and abnormally increased with elevated temperature, leading to the abnormal coercivity-temperature dependence in the corresponding ribbons. The microstructure of the ribbons is sensitively dependent on Sn composition. Our work demonstrates that high ΔSmax tuned by hydrostatic pressure and high magnetocrystalline anisotropy can be realized together in Mn2Sb1-xSnx system, which may help the development of such bifunctional alloy exhibiting refrigerating capability as well as the hard magnetic properties simultaneously.
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