Electron Channeling X-Ray Microanalysis for Cation Configuration in Irradiated Magnesium Aluminate Spinel


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.

This is a preview of subscription content, access via your institution.


  1. [1]

    F. W. Clinard Jr, G F. Hurley, R.A. Youngman and L.W. Hobbs, J. Nucl. Mater. 133–134, 701 (1985).

    Article  Google Scholar 

  2. [2]

    S. J. Zinkle and C. Kinoshita, J. Nucl. Mater. 251, 200 (1997).

    CAS  Article  Google Scholar 

  3. [3]

    K.E. Sickafus, A.C. Larson, N. Yu, M. Nastasi, G.W. Hollenberg, F.A. Garner and R.C. Bradt, J. Nucl. Mater. 219, 128 (1995).

    CAS  Article  Google Scholar 

  4. [4]

    E.A. Cooper, C.D. Hughes, W.L. Earl, K.E. Sickfus, G.W. Hollenberg, F.A. Garner and R.C. Bradt, MRS Symp. Proc. 373, 413 (1995).

  5. [5]

    J.C.H. Spence and J. Taftø, J. Microscopy 130, 147 (1983).

    CAS  Article  Google Scholar 

  6. [6]

    T. Soeda, S. Matsumura, J. Hayata and C. Kinoshita, J. Electron Microsc. 48, 531 (1999).

    CAS  Article  Google Scholar 

  7. [7]

    L. J. Allen, T.W. Josefsson and C.J. Rossouw, Ultramicrosc. 55, 258 (1994).

    CAS  Article  Google Scholar 

  8. [8]

    I. M. Anderson, Acta Mater. 45, 3897 (1997).

    CAS  Article  Google Scholar 

  9. [9]

    C. J. Rossouw, C. T. Forwood, M.A. Gibson and P.R. Miller, Micron 28, 125 (1997).

    CAS  Article  Google Scholar 

  10. [10]

    N. J. Zaluzec, Proc. Microsc and Microanal. ’97, 983 (1997).

    Article  Google Scholar 

  11. [11]

    N. Yu, R. Devanathan, K.E. Sickafus and M. Nastasi, J. Mater. Res. 12, 1766 (1997).

    CAS  Article  Google Scholar 

  12. [12]

    T. Soeda, S. Matsumura, C. Kinoshita and N.J. Zaluzec, submitted to J. Nucl. Mater.

  13. [13]

    T. Soeda, PhD Thesis Research, in progress, Kyushu University.

Download references


The authors should like to express their gratitude to Dr. Lynn Rehn for arrangements for this collaborative work of the two groups at KU and ANL. They are also indebted to Dr. C. J. Rossouw at CSIRO for his kind offer of the efficient calculation program and invaluable comments. This research was partly supported by the US Department of Energy under contract BES-MS W-31-109-Eng-38 and by the Grant-in-Aid for scientific research from the Ministry of Education, Science, Culture and Sports, Japan and from the Japan Society of Promotion of Science.

Author information



Rights and permissions

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Matsumura, S., Soeda, T., Zaluzec, N.J. et al. Electron Channeling X-Ray Microanalysis for Cation Configuration in Irradiated Magnesium Aluminate Spinel. MRS Online Proceedings Library 589, 129 (1999). https://doi.org/10.1557/PROC-589-129

Download citation