Effects of the Atomic Environment on the Magnetic Properties of Cr–Pt Alloys

抄録

The variations in the magnetic properties of binary Cr–Pt alloys with composition and atomic long-range order were determined from magnetic and X-ray diffraction measurements in the concentration range of 18–50 at. % Cr. The ordered phase of this system has the Cu₃Au-type structure at 22–40 at. % Cr and the CuAu I-type structure at 50 at. % Cr. The effective number of Bohr magnetons and the saturation magnetic moment per Cr atom decrease with increasing Cr content in the highly ordered state of the Cu₃Au-type structure and decrease with atomic disordering. The variation in the effective number of Bohr magnetons with composition and atomic ordering can be explained by assuming that the atomic magnetic moment of Cr decreases in proportion to the average number of Cr atoms occupying its nearest-neighboring sites.