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Transmission Electron Microscopy Study of α-Decay Damage in Aeschynite and Britholite

Published online by Cambridge University Press:  03 September 2012

W. L. Gong ,
L. M. Wang ,
R. C. Ewing ,
L. F. Chen  and
W. Lutze
W. L. Gong
Affiliation:
Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87131, wgong@unm.edu Center for Radioactive Waste Management, University of New Mexico, Albuquerque, NM 87131
L. M. Wang
Affiliation:
Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87131, wgong@unm.edu
R. C. Ewing
Affiliation:
Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87131, wgong@unm.edu
L. F. Chen
Affiliation:
Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87131, wgong@unm.edu
W. Lutze
Affiliation:
Center for Radioactive Waste Management, University of New Mexico, Albuquerque, NM 87131
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Abstract

The aeschynite structure-type (Ce,Nd,La,Th,U,Ca)(Nb,Ti)2O6, and the rare-earth silicate apatite structure-type with the formula (Ce,La,Nd,Ca,Th)10(SiO4,PO4)6(O,F,OH)2 are important rare-earth and actinide host phases for high-level nuclear waste. Natural phases of these structure-types have calculated alpha-decay doses up to ∼1017 α-events/mg which have accumulated over hundreds of millions of years. Transmission electron microscopy has been used to study the microstructure of α-decay damage in aeschynite and britholite. Electron diffraction analysis of natural aeschynite revealed that minerals originally crystalline gradually lost their crystallinity with increasing alpha-decay doses. Helium bubbles were found in the aeschynite which have accumulated up to ∼2×1016 α-events/mg. These bubbles may nucleate within collision cascades during a-decay damage. Electron irradiation has an enhanced rare-gas migration and the formation of larger bubbles. High-resolution electron microscopy (HRTEM) revealed that amorphization during accumulation of a-decay damage was from alpha-recoil nuclei collision cascades, in both the aeschynite and britholite.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 465: Symposium II – Scienfific Basis for Nuclear Waste Management XX , 1996 , 649
Copyright
Copyright © Materials Research Society 1997

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References

REFERENCES

1. Gong, W.L., Ewing, R.C., Wang, L.M., and Xie, H.S., Mater. Res. Soc. Symp. Proc. 412, (1996).Google Scholar
2. Weber, W.J., Turcotte, P.R., Bunnell, L.R., Roberts, F.P., Westsik, J.H. Jr., in Ceramics in Nuclear Waste Management, edited by Chikalla, T.D. and Mendel, J.E. (Springfield, Virginia, National Technical Information Service, 1979), pp. 544.Google Scholar
3. McCarthy, G.J., Pepin, J.G., Pfoertsch, D.E., Clarke, D.G., Ceramics in Nuclear Waste Management, edited by Chikalla, T.D. and Mendel, J.E. (Springfield, Virginia, National Technical Information Service, 1979), pp. 315.Google Scholar
4. Turcotte, P.R., Wald, J.W., Roberts, F.P., Rusin, J.M., and Lutze, W., J. Amer. Ceram. Soc. 65, 589 (1982).Google Scholar
5. Weber, W.J., J. Amer. Ceram. Soc. 65, 544 (1982).10.1111/j.1151-2916.1982.tb10779.xGoogle Scholar
6. Ewing, R.C., Weber, W.J., and Lutze, W., in Disposal on Weapon Plutonium, edited by Merz, E.R. and Walter, C.E. (The Netherlands, Kluwer Academic Publishers, 1996), pp. 65.10.1007/978-94-009-0161-2_7Google Scholar
7. Weber, W.J., Radiat. Eff. 77, 295 (1983).10.1080/00337578308228193Google Scholar
8. Weber, W.J., J. Amer. Ceram. Soc. 76, 1729 (1993).10.1111/j.1151-2916.1993.tb06641.xGoogle Scholar
9. Weber, W.J. and Wang, L.M., Mater. Res. Soc. Symp. Proc. 279, 523 (1993).10.1557/PROC-279-523Google Scholar
10. Weber, W.J. and Wang, L.M., Nucl. Instr. Meth. Phys. Res. B 91, 63 (1994).10.1016/0168-583X(94)96191-3Google Scholar
11. Wang, L.M. and Weber, W.J., Philos. Mag. A (in press).Google Scholar
12. Ewing, R.C. and Chakoumakos, B.C., Mineralogical Association of Canada Short Course Handbook, Vol. 8 (1982).Google Scholar
13. Gong, W.L., Ph.D dissertation, Chinese Academy of Sciences, 1988.Google Scholar
14. Giuseppeetti, G. and Tadini, C., N. Jb. Miner. Mh 20, 301 (1990).Google Scholar
15. Fahey, J.A., Weber, W.J., Rotella, F.J., J. Solid State Chem. 60, 145 (1985).Google Scholar
16. Institute of Geochemistry, Chinese Academy of Sciences, Geochemistry of the Baiyun Obo Nb-REE-Fe Ore Deposits (Science Press, Beijing 1988).Google Scholar
17. Zhang, P.S., Yang, Z.M., Tao, K.J., and Yang, X.M., Mineralogy and Geology of Rare Earths in China (Science Press, Beijing, 1995).Google Scholar
18. Hogarth, D.D. and Gottfried, D., Acta Cryst. 8, 291 (1955).Google Scholar
19. Lumpkin, G.R. and Ewing, R.C., Phys. Chem. Minerals 16, 2 (1988).10.1007/BF00201325Google Scholar
20. Weber, W.J., Wald, J.W., and Matzke, Hj., J. Nucl. Mater. 138, 196 (1986).10.1016/0022-3115(86)90006-1Google Scholar
21. Mosley, W.C., J. Am. Ceram. Soc. 54, 474 (1971).10.1111/j.1151-2916.1971.tb12182.xGoogle Scholar
22. Eby, R.K. and Ewing, R.C., Mater. Res. Soc. Symp. Proc. 183, 297 (1990).Google Scholar
23. Ewing, R.C., Chakoumakos, B.C., Lumpkin, G.R., Murakami, T., Greegor, R.B., and Lytle, F.W., Nucl. Instr. Meth. Phys. Res. B32, 487 (1988).10.1016/0168-583X(88)90259-5Google Scholar
24. Ewing, R.C., Weber, W.J., and Clinard, F.W., Jr, Prog. Nucl. Energy 29, 63 (1995).Google Scholar
25. Hishmeh, G.A., Cartz, L., Desage, F., Templier, C., and Desoyer, J.C., J. Mater. Res. 9, 3095 (1994).10.1557/JMR.1994.3095Google Scholar
26. Inagaki, Y., Furuya, H., Idemitsu, K., Banba, T., Matsumoto, S., and Muraoka, S., Mater. Res. Soc. Symp. Proc. 257, 199 (1992).10.1557/PROC-257-199Google Scholar
27. Dé, A.K., Luckscheiter, B., Lutze, W., Malow, G., and Schiewer, E., Ceram. Bull. 55, 500 (1976).Google Scholar
28. Sato, S., Furuya, H., Kozaka, T., Inagaki, Y., and Tamai, T., J. Nucl. Mater. 152, 265 (1988).10.1016/0022-3115(88)90335-2Google Scholar
29. Miller, M.L. and Ewing, R.C., Ultramicroscopy 48, 203 (1993).10.1016/0304-3991(93)90183-XGoogle Scholar
30. Wang, L.M., Miller, M.L., Ewing, R.C., Ultrsmicroscopy 51, 339 (1993).10.1016/0304-3991(93)90159-UGoogle Scholar