Local structure investigations of accumulated damage in irradiated MgAl2O4.
Local structure investigations of accumulated damage in irradiated MgAl2O4.
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辐照 MgAl2O4 中累积损伤的局部结构研究。
DOI：
10.1111/jace.17101
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
K. Okudaira
中科院分区：
文献类型：
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作者：
S. Yoshioka;K. Tsuruta;T. Yamamoto;K. Yasuda;S. Matsumura;T. Sugiyama;Y. Oba;N. Ishikawa;E. Kobayashi;K. Okudaira
利用X射线吸收近边结构（XANES）和小角X射线散射（SAXS）研究了快速重离子诱导下mgal2o4尖晶石的损伤结构。增加100 MeV Xe离子的影响，导致Mg和AlK‐边缘的SAXS强度和XANES光谱变化增加。SAXS观察到离子径迹的损伤区呈直径约5nm的圆柱形。理论XANES光谱表明，实验光谱的变化是由于四面体和八面体之间的阳离子无序。这种无序导致阳离子倒置程度的增加。此外，XANES光谱的定量分析揭示了阳离子在高通量下优先占据八面体位点。
Damaged structures in the MgAl2O4spinel 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 AlK‐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.