Abstract
The multinary compounds Dy6Mn0.3Fe0.7Sb2, Dy6MnSbTe, {Gd, Tb}6FeSbTe, Gd3Tb3FeSbTe, {Gd, Tb}2Dy4Mn0.25Fe0.75Sb2, Gd2Tb4Mn0.25Fe0.75SbTe, Tb6Mn0.25{Fe, Co, Ni}0.75SbTe, Tb6Mn0.4Co0.6SbTe and Tb6Mn0.5Ni0.5SbTe crystallize in the Zr6CoAl2-type structure (ordered variant of the Fe2P structure) (space group P-62m, N 189, hP9). The polycrystalline samples Gd3Tb3FeSbTe, {Gd, Tb}2Dy4Mn0.25Fe0.75Sb2, Gd2Tb4Mn0.25Fe0.75SbTe, Tb6Mn0.25{Fe, Co, Ni}0.75SbTe, Tb6Mn0.4Co0.6SbTe and Tb6Mn0.5Ni0.5SbTe exhibit high-temperature ferromagnetic ordering and low-temperature field sensitive transformation of magnetic ordering. Of these compounds, Gd2Tb4Mn0.25Fe0.75SbTe shows the highest Curie temperature at 292 K with the low-temperature transformation of magnetic ordering at 60 K. Gd3Tb3FeSbTe displays the strongest hard magnetic properties at low temperatures with residual magnetization per formula unit of 16 μB and coercive field of 16 kOe at 2 K. Tb6Mn0.25Ni0.75SbTe and Tb6Mn0.4Co0.6SbTe exhibit large magnetocaloric effect with magnetic entropy change of −4.6 J/kg⋅K and −4.5 J/kg⋅K, respectively, around Curie temperature in a field change of 50 kOe.The specific features of Mn-catalysis/substitution for magnetic properties of these compounds are viewed and discussed.
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