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The magnetic and structural properties of ferrimagnetic (FRI) Mn 1.9 Fe 0.1 Sb 0.9 Sn 0.1 with a Cu 2 Sb-type tetragonal structure were studied by magnetization and high eld X-ray diffraction (XRD) measurements in 10 ≤ T ≤ 773 K and in magnetic elds μ 0 H up to 5 T. The lattice parameters a and c at 285 K were estimated to be 0.407 nm and 0.655 nm, respectively. The saturation magnetization at 10 K was determined to be 39.1 Am 2 /kg. It was observed that a rst order magnetic transition (FOMT) with a thermal hysteresis occurred in the vicinity of 310 K under low magnetic elds. This FOMT disappeared easily by applying magnetic elds over 0.4 T.

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