On New Ferromagnetic Intermetallic Compounds PtMnSn and PtMnSb

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Crystal structures and magnetic properties of Pt-Mn-Sn and Pt-Mn-Sb alloys have been investigated by means of X-ray analysis, magnetic analysis and nuclear magnetic resonance. It is found that the alloys with the stoichiometric compositions PtMnSn and PtMnSb are ferromagnetic and that the former has a structure of the CaF 2 (Cl) type while the latter an ordered structure of the MgAgAs (Cl b ) type. Pt 1.01 Mn 0.99 Sn 1.00 and Pt 1.01 Mn 1.00 Sn 1.00 alloys have lattice parameters of 6.263 and 6.201 Å at room temperature, ferromagnetic Curie temperatures of 360° and 582°K, numbers of Bohr magnetons of 3.65 and 4.14 µ B /mol at 0°K and the internal magnetic field of 204.5 and 220.2 kOe at Mn 55 nucleus at 77°K, respectively.