Are there stable long-range ordered Fe(1-x)Cr(x) compounds?

Details Are there stable long-range ordered Fe(1-x)Cr(x) compounds? Are there stable long-range ordered Fe(1-x)Cr(x) compounds?

2010-09-02

arxiv.org/abs/1009.0510v1

Applied Physics Letters 92, 141904 (2008)

Physics

Condensed Matter

Materials Science

3 pages, 2 figures

Scientific paper

10.1063/1.2907337

The heat of formation of Fe-Cr alloys undergoes an anomalous change of sign at small Cr concentrations. This observation raises the question whether there are intermetallic phases present in this composition range. Here we report the discovery of several long-range ordered structures that represent ground state phases at zero Kelvin. In particular we have identified a structure at 3.7% Cr with an embedding energy which is 49 meV/Cr atom below the solid solution. This implies there is an effective long-range attractive interaction between Cr atoms. We propose that the structures found in this study complete the low temperature-low Cr region of the phase diagram.

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