Electron channeling X-ray microanalysis for cation configuration in irradiated magnesium aluminate spinel

Syo Matsumura, T. Soeda, N. J. Zaluzec, C. Kinoshita

研究成果: ジャーナルへの寄稿学術誌査読

13 被引用数 (Scopus)

抄録

High angular resolution electron channeling x-ray spectroscopy (HARECXS) was examined as a practical tool to locate lattice-ions in spinel crystals. The orientation dependent intensity distribution of emitted x-rays obtained by HARECXS is so sensitive to lattice-ion configuration in the illuminated areas that the occupation probabilities on specific positions in the crystal lattice can be determined accurately through comparison with the theoretical rocking curves. HARECXS measurements have revealed partially disordered cation arrangement in MgO·nAl2O3 with n=1.0 and 2.4. Most Al3+ lattice-ions occupy the octahedral (VI) sites with 6-fold coordination, while Mg2+ lattice-ions reside on both the tetrahedral (IV) and the octahedral (VI) sites. The structural vacancies are enriched in the IV-sites. Further evacuation of cations from the IV-sites to the VI-sites is recognized in a disordering process induced by irradiation with 1 MeV Ne+ ions up to 8.9 dpa at 870 K.

本文言語英語
ページ(範囲)129-134
ページ数6
ジャーナルMaterials Research Society Symposium - Proceedings
589
出版ステータス出版済み - 12月 1 2000

!!!All Science Journal Classification (ASJC) codes

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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