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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Structural and Mossbauer spectroscopic study of hexagonal Laves-phase Zr(Fe sub x Cr sub 1-x ) sub 2 alloys and their hydrides
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Structural and Mossbauer spectroscopic study of hexagonal Laves-phase Zr(Fe sub x Cr sub 1-x ) sub 2 alloys and their hydrides

机译：六角形Laves相Zr（Fe sub x Cr sub 1-x）sub 2合金及其氢化物的结构和Mossbauer光谱研究

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摘要

Hexagonal (C14) Laves-phase Zr(Fe sub x Cr sub 1-x sub 2 alloys with x = 0.3, 0.4, 0.5, 0.6 and 0.7 have been prepared by arc melting and the corresponding hydrides have been formed by hydrogen uptake at 1 atm pressure. X-ray diffractograms have been measured and analyzed with the Rietveld method. sub 57 Fe Mossbauer spectra, measured at room temperature, could be fitted with two doublets with 3 div by 1 area ratio, corresponding to the two Fe sites in the C14 structure. The quadrupole splitting ( Delta ) and isomer shift ( delta ) dependences on x are discussed in terms of volume and charge effects. The hydrides showed volume expansions of up to 22% without any crystal structure change. Both Mossbauer hyperfine parameters Delta and delta increased markedly in the hydrides as compared to the alloys. Tetrahedral hole radii have been calculated from measured crystalline parameters and their relationship to hydrogen site preferences is discussed.
机译：通过电弧熔化制备了x = 0.3、0.4、0.5、0.6和0.7的六方（C14）Laves相Zr（Fe sub x Cr sub 1-x sub 2合金，并通过在1处吸收氢形成了相应的氢化物大气压下，用Rietveld方法测量和分析了X射线衍射图，在室温下测得的亚57 Fe Mossbauer光谱可以与两个二重峰拟合，面积比为3 div by 1 div，分别对应于C14结构。讨论了四极分裂（Delta）和异构体位移（delta）对x的依赖关系，涉及体积和电荷效应。氢化物的体积膨胀高达22％，没有任何晶体结构变化。Mossbauer的超细参数Delta和与合金相比，氢化物中的δ明显增加，根据测量的晶体参数计算了四面体的孔半径，并讨论了它们与氢位置偏好的关系。

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