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Structure of the Sigma-Phase in the Iron–Chromium and Cobalt–Chromium Systems

1951; Nature Portfolio; Volume: 167; Issue: 4240 Linguagem: Inglês

10.1038/167192a0

1476-4687

G. J. Dickins, AUDREY M. B. DOUGLAS, W. H. Taylor,

Microstructure and Mechanical Properties of Steels

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.