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Study of the chemical dependence of the effective pair potentials of Co–Pt alloy
Author(s) -
Capitan M. J.,
Lefebvre S.,
Calvayrac Y.,
Bessiere M.,
Cenedese P.
Publication year - 1999
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889899009887
Subject(s) - alloy , scattering , intensity (physics) , work (physics) , computation , displacement (psychology) , materials science , condensed matter physics , chemistry , order (exchange) , molecular physics , thermodynamics , physics , optics , mathematics , metallurgy , psychology , finance , algorithm , economics , psychotherapist
Effective pair interaction potentials of Co–Pt alloy have been obtained from X‐ray diffuse scattering measurements on short‐range ordered Co 3 Pt and Co 65 Pt 35 single crystals. The present work presents the evolution of the interaction energies in the Co–Pt alloy when the Pt concentration varies from 25 to 35 at. %. The aim of this work was to provide data in order to improve the computation of the phase diagram by allowing a concentration dependence of the effective pair potentials. Different methods have been proposed for separating the contributions of local order and first‐order displacements from the total diffuse intensity. A comparison of different methods of analysis of Co 3 Pt diffuse‐scattering intensity data is reported in the Appendix of this article; it shows that the second‐order displacement terms are almost zero near the transition temperature.