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首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >Site occupancy and lattice parameters in sigma-phase Co-Cr alloys
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Site occupancy and lattice parameters in sigma-phase Co-Cr alloys

机译:σ相Co-Cr合金的位点占有率和晶格参数

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摘要

Neutron powder diffraction was used to study the distribution of Co and Cr atoms over different lattice sites as well as the lattice parameters of sigma-phase compounds Co100-x Cr x with x = 57.0, 62.7 and 65.8. From the diffractograms recorded in the temperature range of 4.2-300 K it was found for the five crystallographically independent sites that A (2a) and D (8i) are predominantly occupied by Co atoms, while sites B (4f), C (8i) and E (8j) mainly accommodate Cr atoms. The lattice parameters a and c exhibit linear temperature dependencies, with different expansion coefficients in the temperature ranges of 4.2-100 and 100-300 K.
机译:用中子粉末衍射法研究了Co和Cr原子在不同晶格位点上的分布,以及x = 57.0、62.7和65.8的σ相化合物Co100-x Cr x的晶格参数。从在4.2-300 K的温度范围内记录的衍射图可发现,在五个晶体学上独立的位点,A(2a)和D(8i)主要被Co原子占据,而位点B(4f),C(8i) E(8j)主要含有Cr原子。晶格参数a和c表现出线性温度依赖性,在4.2-100和100-300 K的温度范围内具有不同的膨胀系数。

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