Magnetic and Electrical Properties of ${hbox{Mn}}_{2 - {rm x}}{hbox{Ni}}_{1 + {rm x}}{hbox{Sb}}$

摘要

X-ray powder diffraction, magnetization and electrical resistivity measurements were carried out for polycrystalline Heusler alloys ${hbox{Mn}}_{2 - {rm x}}{hbox{Ni}}_{1 + {rm x}}{hbox{Sb}}$ ($0 leq x leq 1$) in 4.2-720 K and in magnetic fields up to 16 T. The lattice parameter $a$ was determined to be 0.5974 nm for ${hbox{Mn}}_{2}{rm NiSb}$ (${rm x} = 0$) and 0.6021 nm for ${rm MnNi}_{2}{hbox{Sb}}$ (${rm x} = 1$) at room temperature. The parameter $a$ shrinks for $0.4 leq {rm x} leq 0.75$ . The Curie temperatures ${T_{rm C}}$ for ${rm x} = 0$ and 1 were determined to be 623 K and 353 K, respectively. For $0.25 leq {rm x} < 0.8$, ${T_{rm C}}$ was enhanced up to 663 K (${rm x} = 0.5$). Obtained results showed the unique behaviors on the structural, magnetic and electrical properties for the intermediate Mn-Ni composition.