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Characterization of Radiation Damage at the Nb Site in Natural Pyrochlores and Samarskites by X-Ray Absorption Spectroscopy

  • R. B. Greegor (a1), F. W. Lytle (a1), B. C. Chakoumakos (a2), G. R. Lumpkin (a2), J. K. Warner (a2) and R. C. Ewing (a2)...

Abstract

X-ray absorption spectroscopy has been used to investigate the Nb B-site in pyrochlores (A1.2B2O6Y0–1, Fd3m, Z=8) and samarskites (A3B5O16) in both metamict and annealed condition. The XANES and EXAFS measurements indicate significant changes in pyrochlore and smaller changes in samarskite as a result of radiation damage. In the metamict state the Nb site in both pyrochlores and samarskites is similar to Nb in Nb2O5. Short Nb-O (1.65Å) bonds are not disrupted by alpha-decay/recoil-nuclei events as much as longer bonds (2.00Å). This increases the asymmetry and static disorder at the local Nb site while long range order is greatly diminished resulting in considerable distribution in Nb-M distances and bond angles.

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[1] Hogarth, D.D., Am. Mineral. 62, 403 (1977).
[2] Dosch, R.G.. Headley, T.J. and Hlave, P., J. Am. Ceramic Soc. 67, 35 (1984).
[3] Morgan, P.E.D., Shaw, T.M. and Pugar, E.A. in: Advances in Ceramics Vol 8: Nuclear Waste Management, edited by Wicks, G.G. and Ross, W.A., (American Ceramic Society, Columbus, Ohio 1984) p. 209221.
[4] Ringwood, A.E., Kesson, S.E., Ware, N.G., Hibberson, W. and Major, A., Nature 278, 278 (1979).
[5] Haggerty, S.E. in: Ann. Rev. Earth Planet. Sci., Vol. 11. edited by Wetherill, G.W., Albee, A.L. and Stehli, F.G., (Annual Reviews Inc., Palo Alto, CA, 1983) pp. 133163.
[6] Sugitani, Y., Suzuki, Y. and Nagashima, K., Am. Mineral. 62, 377 (1984).
[7] Sugitani, Y., Suzuki, Y. and Nagashima, K., Am. Mineral. 70, 856 (1985).
[8] Nilssen, B., Nor. Geol. Tidsskr. 50, 357 (1970).
[9] Muller, O. and Roy, R., The Major Ternary Structural Families (Springer, New York, 1974).
[10] Greegor, R.B., Lytle, F.W., Ewing, R.C. and Haaker, R.F., Nuc. Inst. and Meth. in Phys. Res. B1, 587 (1984).
[11] Greegor, R.B., Lytle, F.W., Chakoumakos, B.C., Lumpkin, G.R. and Ewing, R.C., Mat. Res. Soc. Sym. Proc., Vol. 44, 655 (1985).
[12] Greegor, R.B., Lytle, F.W., Chakoumakos, B.C., Lumpkin, G.R. and Ewing, R.C., Mat. Res. Soc. Sym. Proc., Vol. 50, 387 (1986).
[13] Greegor, R.B., Lytle, F.W., Chakoumakos, B.C., Lumpkin, G.R. and Ewing, R.C., Mat. Res. Soc. Sym. Proc., Vol. 84, 645 (1987).
[14]. Lumpkin, G.R., Ph.D. Dissertation, Dept. of Geology, University of New Mexico (1988).
[15] Warner, J.K., Master Dissetaüon, Dept. of Geology, University of New Mexico (1988).
[16] Lytle, F.W., Greegor, R.B. and Panson, A.J., Phys. Rev. B 37(4), 1550 (1988).
[17] Fauquier, D. and Gasperin, M., Bull. Soc. Fr. Mineral. Cristallogr. 21, 258(1970).
[18] Gatehouse, B.M. and Wadsley, A.D., Acta Cryst. 12, 1545(1964).
[19] Teoand, B.K., Lee, P.A.. J. Am. Chem. Soc. 101(11), 2815 (1979).
[20] Keller, L. and Wagner, C.N.J., Am. Mineral. 61, 459(1983).
[21] Barinsky, R.L. and Kulikova, L.M., Phys. Chem. Minerals. 1, 325(1977).
[22] Nakai, I., Akimoto, J., Imafuku, M., Miyawaki, R. and Sugitani, Y., Phys. Chem Minerals 15, 113(1987).
[23] Naguiband, H.M., Kelly, R., Radiation Effects 25, 1 (1975).

Characterization of Radiation Damage at the Nb Site in Natural Pyrochlores and Samarskites by X-Ray Absorption Spectroscopy

  • R. B. Greegor (a1), F. W. Lytle (a1), B. C. Chakoumakos (a2), G. R. Lumpkin (a2), J. K. Warner (a2) and R. C. Ewing (a2)...

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