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Abstract
An analytical electron microscope study was carried out on single crystal specimens of magnesium aluminate spinel irradiated with 200 MeV Xe 14+ ions up to 5.0 × 10 15 and 2.0 × 10 16 ions/m 2 at ambient temperature. Bright-field images showed structurally disordered columns of about 4–5 nm in diameter along ion tracks. Tiny pits were observed on the incident surface of the columns. Quantitative HARECXS analysis of atomic configurations revealed that disordering proceeds in more extended regions over 10 nm in diameter. The configurations of Al 3+ ions are more disordered than that of Mg 2+ ions. The disordered areas are appeared to overlap each other in the specimen irradiated with 2.0 × 10 16 ions/m 2.
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