Neutron Diffraction Study of Short-Range Order in β-CuZn

C. B. Walker and D. T. Keating
Phys. Rev. 130, 1726 – Published 1 June 1963
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Abstract

Neutron diffuse scattering measurements have been made on an isotopically enriched single crystal of β CuZn at a series of temperatures above Tc. The observed short-range order scattering exhibited the general characteristics of critical scattering, quite unlike the diffuse scattering reported for any other ordering alloy, and confirmed that the order-disorder transformation in this alloy is a phase transformation of second (or higher) order. No quantitative evaluation of the short-range order parameters from the measured scattering was possible. A comparison of the measured scattering with calculations based on the theories of Zernike, Cowley, and Elliott and Marshall showed rather good agreement, suggesting that these simple theories give a reasonable approximation to the actual short-range order correlations above Tc. From a consideration of the discrepancies between these theories and the experimental data, it appears that at temperatures above Tc the Ising model forms a surprisingly good model for this alloy.

  • Received 25 January 1963

DOI:https://doi.org/10.1103/PhysRev.130.1726

©1963 American Physical Society

Authors & Affiliations

C. B. Walker

  • Institute for the Study of Metals, University of Chicago, Chicago, Illinois

D. T. Keating

  • Brookhaven National Laboratory, Upton, New York

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Issue

Vol. 130, Iss. 5 — June 1963

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