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arXiv 1009.0510cond-mat.mtrl-sci
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是否存在稳定的长程有序Fe(1-x)Cr(x)化合物?

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

Paul Erhart, Babak Sadigh, Alfredo Caro

摘要:

Fe-Cr合金的生成热在低Cr浓度下发生符号的反常变化。这一观察结果提出了在该组成范围内是否存在金属间相的问题。在这里,我们报告的发现,代表基态阶段在零开尔文的几个长程有序结构。特别是,我们已经确定了在3.7%的Cr的嵌入能量为49毫电子伏/铬原子以下的固溶体的结构。这意味着Cr原子之间存在有效的长程吸引相互作用。我们建议,在这项研究中发现的结构完成的低温低铬区的相图。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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