Damaged structures in the MgAl₂O₄ spinel induced by swift heavy ions were investigated using the X‐ray absorption near edge structure (XANES) and small angle X‐ray scattering (SAXS). Increasing the fluence of 100 MeV Xe ions leads to increased SAXS intensity and XANES spectral changes on both Mg and Al K ‐edges. The damaged regions of ion tracks were observed by SAXS to be cylindrical in shape with a diameter of 5 nm. The theoretical XANES spectra indicated that the changes in the experimental spectra were due to the cationic disordering between tetrahedral and octahedral sites. This disordering caused an increase in the inversion degree of the cations. Furthermore, the quantitative analysis of the XANES spectra revealed the preferential occupation of cations at the octahedral sites at high fluence.

中文翻译：

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MgAl2O4辐照累积损伤的局部结构研究

利用近边缘结构的X射线吸收（XANES）和小角度X射线散射（SAXS）研究了快速重离子在MgAl ₂ O ₄尖晶石中引起的结构破坏。增加100 MeV Xe离子的通量会导致Mg和Al K上SAXS强度和XANES光谱变化增加边缘。通过SAXS观察到离子径迹的损坏区域为圆柱形，直径为5nm。理论XANES光谱表明，实验光谱的变化是由于四面体和八面体位点之间的阳离子无序。这种无序性导致阳离子的转化度增加。此外，对XANES光谱的定量分析显示，高通量的八面体位点优先占据阳离子。