J. Phys. I France
Volume 2, Numéro 8, August 1992
Page(s) 1559 - 1564
DOI: 10.1051/jp1:1992227
J. Phys. I France 2 (1992) 1559-1564

Cluster probabilities in binary alloys from diffraction data

I.V. Masanskii and V.I. Tokar

Institute of Metal Physics, Academy of Sciences of Ukraine, 36 Vernadsky Street, 252680, Kiev-142, Ukraine

(Received 13 May 1992, accepted 15 May 1992)

A method is proposed which permits us to calculate, - from diffuse scattering data -, the probabilities for various clusters of atoms to appear in substitutional disordered alloys. It leads to simple, Taylor-like expressions for these probabilities in terms of experimentally measured short-range order parameters. Explicit calculations are performed for two clusters, nearest-neighbour triangle and tetrahedron, on the face-centered cubic lattice. The results obtained agree well with those of other approaches. The applicability of the Kirkwood superposition approximation to alloys is discussed.

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