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X-Ray Diffraction Study of Ordering in Two Sigma Phases

Published online by Cambridge University Press:  06 March 2019

R. W. Spor ,
H. Claus  and
Paul A. Beck
R. W. Spor
Affiliation:
University of Illinois Urbana, Illinois
H. Claus
Affiliation:
University of Illinois Urbana, Illinois
Paul A. Beck
Affiliation:
University of Illinois Urbana, Illinois
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Abstract

X-ray powder pattern line intensities were measured for the (Cr, Re)σ and (Re, Fe)σ phases by a step-scanning diffractometer, using CrKα radiation, scintillation counter, and a pulse height analyzer. The measured intensity ratios for all available pairs of adjacent lines were compared by means of a computer with the corresponding calculated intensity ratios based on approximately 1800 different ordering schemes for each alloy. The results showed ordering in both alloys, and indicated that the ordering was based on atomic size. These results are different from those obtained previously by Kasper and Waterstrat (no ordering), and by Ageyev et al. [In (Cr, Re)σ the Cr atoms are preferentially in large coordination number positions.]

Type
Research Article
Information
Advances in X-Ray Analysis , Volume 10: Fifteenth Annual Conference on Applications of X-ray Analysis, August 10-12, 1966 , 1966 , pp. 213 - 220
Copyright
Copyright © International Centre for Diffraction Data 1966

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