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The Effects of Annealing on the Structure and Distribution of Charge States of Iron Implanted into A-Al2O, at 77 K

  • C. J. Mchargue (a1), P. S. Sklad (a1), J. C. Mccallum (a1), C. W. White (a1), J. C. Mccallum (a1), C.W. White (a1), A. Perez (a1) and G. Marest (a2)...

Abstract

Implantation of iron Into α-Al2O3 at 77 K produces an amorphous state for fluences greater than about 3 × 1016 Fe/cm2. Iron in the as-implanted (amorphous) specimens is distributed among two Fe2+, two Fe4+, and the Fe° states. The conversion electron Mössbauer (CEMS) spectra for a sample containing 7 × 1016 Fe/cm2 show all iron to be converted to Fe3+ after annealing in oxygen for 1 h at 700°C and above. The transmission electron microscopy (TEM) shows the structure to be mostly Y-A120, after the 900°C anneal and all α-Al2O, after the 1100°C anneal.

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1 Sawicka, B. D. and Sawicki, J. A., Topics in Current Physics, edited by Gonser, U. (Springer, Berlin, 1981) 60, pp. 139166.
2 White, C. W., McHargue, C. J., Sklad, P. S., Boatner, L. A., and Farlow, G. C., Mater. Sci. Reports 4, 41 (1989).
3 Farlow, G. C., White, C. W., McHargue, C. J., Sklad, P. S., and Appleton, B. R., Nucl. Instrum. Methods B7/8, 541 (1985).
4 McHargue, C. J., Farlow, G. C., Sklad, P. S., White, C. W., Perez, A., Kornilios, N., and Marest, G., Nucl. Instrum. Methods B19/20, 813 (1987).
5 McHargue, C. J., Sklad, P. S., McCallum, J. C., White, C. W., Perez, A., and Marest, G., accepted for publication in Nucl. Instrum. Methods in Phys. Res. B.

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