Hakaru Masumoto1 and Kiyoshi Watanabe1
1The Foundation: The Research Institute of Electric and Magnetic Alloys, Sendai
Crystal srtuctures and magnetic properties of Pt-Mn-Sb alloys have been investigated by means of X-ray and magnetic analysis. It has been found that a new C1b type compound PtMnSb exists in the Pt-Mn-Sb system and forms solid solutions in the compositional range of Pt1.00Mn1.00Sb1.00∼Pt0.94Mn1.12Sb0.94. These alloys in solid solution have lattice parameters of about 6.196 ∼ 6.228 Å at room temperature, saturation magnetizations of 62.0 ∼ 64.0 e.m.u./g at absolute zero, effective Bohr magneton numbers of 3.73 ∼ 4.14 μ B per Mn atom at absolute zero, and Curie temperatures of 522° ∼ 595°K. The magnetic susceptibility of these alloys has been found to satisfy the Curie-Weiss law above the Curie temperature.
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