Temperature dependent local atomic structures in the traditional Fe65Ni35 Invar alloy by x-ray fluorescence holography
Temperature dependent local atomic structures in the traditional Fe65Ni35 Invar alloy by x-ray fluorescence holography
复制标题
通过 X 射线荧光全息术研究传统 Fe65Ni35 Invar 合金中温度相关的局部原子结构
DOI：
10.1002/sia.6474
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发表时间：
2018
影响因子：
1.7
通讯作者：
and K. Hayashi
中科院分区：
文献类型：
--
作者：
J. R. Stellhorn;Y. Ideguchi;S. Hosokawa;N. Happo;T. Matsushita;K. Yubuta;M. Suzuki;H. Ishii;Y.-F. Liao;K. Kimura;and K. Hayashi
在100和300 K温度下，对单晶Fe65Ni35Invar合金进行了Fe和Ni α x射线荧光全息测量，分别研究了Fe和Ni原子周围三维局部结构的温度依赖性。采用aL1‐正则化线性回归对实验数据进行详细分析，得到了局部结构信息。在100k时，两种元素周围的局部原子排列显示出结构。然而，在300k时，只有Fe周围的图像显示abcc - like邻接排列。根据这些X射线荧光全息数据，我们提出了一个模型，随着温度的升高，具有低自旋态的铁原子进入晶格的中心位置并稳定下来。然后，仅在中心Fe原子周围的面心位置的原子就会产生大的角位置波动。
Fe and NiKαX‐ray fluorescence holography measurements were conducted on a single crystal Fe65Ni35Invar alloy at 100 and 300 K to investigate the temperature dependence of the 3‐dimensional local structures around the Fe and Ni atoms, respectively. Local structural information was obtained by detailed analyses using aL1‐regularized linear regression for the experimental data. At 100 K, the local atomic arrangements around both the elements showfccstructures. At 300 K, however, only the image around Fe shows abcc‐like neighboring arrangement. From these X‐ray fluorescence holography data, we propose a model that with increasing temperature, an Fe atom with the low‐spin state enters at the central position of thefcclattice and is stabilized. And then, large angular positional fluctuations are induced for the atoms at the face‐centered positions around the central Fe atom only.