Abstract
THE application of X-ray single-crystal and powder methods has shown that the σ-phase structure is based on a tetragonal unit cell, containing 30 atoms, with space group P 4/mnm, P 4mn or P &4bar;n2. For the σ-phase of iron–chromium, a = 8.790 A., c = 4.559 A. This cell is not the same as found by Duwez and Baen1 using powder methods only.
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Duwez, P., and Baen, S. R., A.S.T.M. Preprint 47 (1950). See also Pietrokowsky, P., and Duwez, P., J. Metals, 188, 1283 (1950).
Tucker, Charles W., jun., Science, 112, 448 (1950), and (private communication, 1950) Document No. AECD-2957, “An Approximate Crystal Structure of the β-Phase of Uranium”
Dickins, G. J., Douglas, Audrey M. B., and Taylor, W. H., J. Iron and Steel Inst. (in the press).
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DICKINS, G., DOUGLAS, A. & TAYLOR, W. Structure of the Sigma-Phase in the Iron–Chromium and Cobalt–Chromium Systems. Nature 167, 192 (1951). https://doi.org/10.1038/167192a0
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DOI: https://doi.org/10.1038/167192a0
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