Neutron scattering studies of short-range order, atomic displacements, and effective pair interactions in a null-matrix Ni0.5262 Pt0.48 crystal

J. A. Rodriguez, S. C. Moss, J. L. Robertson, J. R D Copley, D. A. Neumann, J. Major

Research output: Contribution to journalArticle

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Abstract

The best known exception to the Heine-Sampson and Bieber-Gauthier arguments for ordering effects in transition metal alloys (similar to the Hume-Rothery rules) is a NiPt alloy, whose phase diagram is similar to that of the CuAu system. Using neutron scattering we have investigated the local atomic order in a null-matrix Ni0.5262 Pt0.48 single crystal. In a null-matrix alloy, the isotopic composition is adjusted so that the average neutron scattering length vanishes (Ni62 has a negative scattering length nearly equal in magnitude to that of Pt). Consequently, all contributions to the total scattering depending on the average lattice are suppressed. The only remaining components of the elastic scattering are the short-range order (SRO) and size effect terms. These data permit the extraction of the SRO parameters (concentration-concentration correlations) as well as the displacement parameters (concentration-displacement correlations). Using the Krivoglaz-Clapp-Moss theory, we obtain the effective pair interactions (EPIs) between near neighbors in the alloy. The results can be used by theorists to model the alloy in the context of the electronic theory of alloy phase stability, including a preliminary evaluation of the local species-dependent displacements. Our maps of V (q), the Fourier transform of the EPIs, show very similar shapes in the experimental and reconstructed data. This is of importance when comparing to electronic structure calculations.

Original languageEnglish
Article number104115
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume74
Issue number10
DOIs
Publication statusPublished - 2006

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Neutron scattering
neutron scattering
Crystals
matrices
crystals
interactions
Transition metal alloys
Scattering
Elastic scattering
Phase stability
Bryophytes
Phase diagrams
Electronic structure
Fourier transforms
scattering
Single crystals
elastic scattering
transition metals
phase diagrams
electronic structure

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Neutron scattering studies of short-range order, atomic displacements, and effective pair interactions in a null-matrix Ni0.5262 Pt0.48 crystal. / Rodriguez, J. A.; Moss, S. C.; Robertson, J. L.; Copley, J. R D; Neumann, D. A.; Major, J.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 74, No. 10, 104115, 2006.

Research output: Contribution to journalArticle

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