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Structure analysis of NiZr_2 in reciprocal and real space

机译:Nizr_2在互惠和真实空间中的结构分析

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The temperature dependence of the geometric structure of amorphous and crystallized Ni_(33)Zr_(67) was investigated by means of in situ synchrotron X-ray diffraction. The crystal structure parameters of the tetragonal NiZr_2 phase were determined by the Rietveld refinement of the X-ray diffraction patterns. The lattice parameters a_0, c_0, and therefore the interatomic distances increase linearly with temperature. The behavior of the short-range order was analyzed by the corresponding atomic pair correlation functions G(r). The position of the first maximum of G(r) at r_1 decreases with temperature. The analysis of real space data of the crystallized state of Ni_(33)Zr_(67) shows that the measured G(r) function consists of several superimposed, non-resolved inter-atomic distances. The individual distances increase with temperature in agreement with the Rietveld analysis. The position of the first maximum r_1 is additionally influenced by the thermal broadening of the distance distributions leading to the "unphysical" reduction of r_1 with temperature.
机译:通过原位同步X射线衍射研究了无定形和结晶Ni_(33)Zr_(67)的几何结构的温度依赖性。通过X射线衍射图案的RIETVELD细化来确定四边形NizR_2相的晶体结构参数。晶格参数A_0,C_0,因此在线性距离随温度线性增加。通过相应的原子对相关函数G(R)分析了短程顺序的行为。 R_1在R_1的第一个G(R)的位置随温度降低。 Ni_(33)Zr_(67)结晶状态的实际空间数据的分析表明,测量的G(R)函数由几个叠加的,不分辨的原子距离组成。各个距离随着RIETVELD分析的协议而增加。第一最大R_1的位置另外受到距离分布的热扩大的影响,导致具有温度的“不经关注的”R_1的“不良”减少。

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