sigma相Co-Cr合金中的位占率和晶格参数。

IF 1.9 3区化学

Acta Crystallographica Section B-structural Science Pub Date : 2012-04-01 Epub Date: 2012-03-20 DOI:10.1107/S0108768112006234

Jakub Cieslak, Stanislaw M Dubiel, Michael Reissner

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引用次数: 18

摘要

采用中子粉末衍射法研究了Co和Cr原子在不同晶格位上的分布，以及x = 57.0、62.7和65.8的sigma相化合物Co(100 - x)Cr(x)的晶格参数。在4.2 ~ 300 K温度范围内记录的衍射图发现，在5个晶体独立的位置上，A (2a)和D (8i)主要被Co原子占据，而B (4f)、C (8i)和E (8j)主要被Cr原子占据。晶格参数a和c在4.2 ~ 100 K和100 ~ 300 K范围内具有不同的膨胀系数，呈线性温度依赖性。

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Site occupancy and lattice parameters in sigma-phase Co-Cr alloys.

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 Co(100 - 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.

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来源期刊

Acta Crystallographica Section B-structural Science 化学-晶体学

自引率

5.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials publishes scientific articles related to the structural science of compounds and materials in the widest sense. Knowledge of the arrangements of atoms, including their temporal variations and dependencies on temperature and pressure, is often the key to understanding physical and chemical phenomena and is crucial for the design of new materials and supramolecular devices. Acta Crystallographica B is the forum for the publication of such contributions. Scientific developments based on experimental studies as well as those based on theoretical approaches, including crystal-structure prediction, structure-property relations and the use of databases of crystal structures, are published.