Phys. Rev. B 61, 14975–14983 (2000)Experimental determination of pair interaction energies in a CoPt3 single crystal and phase-diagram calculationsReceived 18 November 1999; published in the issue dated 1 June 2000 The short-range order in a CoPt3 single crystal at 1083 K was measured using neutron diffuse scattering in the (100) and (110) reciprocal planes. The data were used in conjunction with the inverse cluster variation method in order to extract the first four and the sixth effective pair interaction energies. The interactions obtained from the experimental short-range order intensities are used to calculate the Pt-rich side of the phase diagram using the cluster variation method, the order-disorder transition temperature at the stoichiometric composition by Monte Carlo simulations, and the unrelaxed antiphase boundary energies. The agreement with experimental data is excellent. Comparison of the CoPt3 pair energies with those similarly obtained in Co3Pt by other authors shows an important dependence of the nearest-neighbor pair interaction with concentration. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.61.14975
DOI:
10.1103/PhysRevB.61.14975
PACS:
61.12.Ex, 61.50.Ks, 75.50.Bb
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