A Partial Phase Diagram of Pt-Rich Pt–Mn Alloys

概要

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We have performed the X-ray and electron diffraction studies to reconstruct a partial phase diagram of Pt-rich Pt–Mn alloys in the composition range of 10 to 35 at.% Mn. Electrical resistivity measurement was also used for determining the order–disorder transition temperature in Pt–14.2 at.% Mn alloy. The phase boundary between Cu3Au type and ABC6 type ordered structures is established, in which the latter has been found recently by the present authors [J. Phys. Soc. Jpn. 71 (2002) 681]. In the ABC6 type ordered phase, superlattice reflections both at $\frac{1}{2}\frac{1}{2}\frac{1}{2}$ and its equivalent position (L-point) and at 100, 110 and their equivalent positions (X-point) appear in the composition range from 12.5 to 14.4 at.% Mn below 682°C. In the Cu3Au type ordered phase, diffuse maxima at L-point appear in the composition range from 15.9 to 19.7 at.% Mn in addition to the superlattice reflections at X-point. The Cu3Au type ordered structure is found to be stable in the composition range from 19.7 to 35 at.% Mn without appearing any diffuse scattering at L-point. Furthermore, the phase boundary between Cu3Au type and disordered state is also established.
Physical Society of Japanの論文
2002-10-15