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首页> 外文期刊>Journal of Physics. Condensed Matter >Study of hyperfine-field distributions and the lattice dynamics of Fe50Ni30Cr20 alloy by using 57Fe Mossbauer spectroscopy
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Study of hyperfine-field distributions and the lattice dynamics of Fe50Ni30Cr20 alloy by using 57Fe Mossbauer spectroscopy

机译：用57Fe Mossbauer光谱研究Fe50Ni30Cr20合金的超细场分布和晶格动力学

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摘要

This paper reports a 57Fe Mossbauer spectroscopic study of a polycrystalline sample of the substitutionally disordered, isostructural (fcc), ternary alloy Fe50Ni30Cr20 over the temperature range 10 to 295 K. The data have been analysed in terms of the magnetic phase transitions occurring in the alloy by examining the temperature dependence of the Mossbauer parameters. The Curie temperature has been determined by fitting the average hyperfine-field values obtained at different temperatures. In order to achieve a detailed understanding of the nature of the hyperfine-field distribution corresponding to the Mossbauer spectra of this alloy, the curves representing the probabilities of the hyperfine-field distributions versus the hyperfine field have been refitted by using two independent Gaussians. On the basis of these fits, the local magnetic ordering of this alloy at low temperature has been described. The data on the second-order Doppler shift have been analysed in order to obtain an estimate of the Debye temperature, ΘD, and a description of the lattice dynamics.
机译：本文报道了57Fe Mossbauer光谱研究了10至295 K温度范围内取代无序，同构（fcc）三元合金Fe50Ni30Cr20的多晶样品。已对数据进行了分析，分析了合金中发生的磁相变通过检查Mossbauer参数的温度依赖性。居里温度是通过拟合在不同温度下获得的平均超精细场值确定的。为了详细了解与该合金的Mossbauer光谱相对应的超精细场分布的性质，使用两个独立的高斯函数对代表超精细场分布与超精细场的概率的曲线进行了拟合。基于这些拟合，已经描述了该合金在低温下的局部磁有序。分析了有关二阶多普勒频移的数据，以获得德拜温度ΘD的估计值以及晶格动力学的描述。

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