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Irradiation-Induced Amorphization Of Titanite

Published online by Cambridge University Press:  21 March 2011

A. Meldrum
A. Meldrum*
Affiliation:
Dept. of Physics, University of Alberta, Edmonton, AB T6G 2J1, CANADA
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Abstract

Titanite (CaTiSiO5) is a widely occurring accessory mineral that contains ppm-level concentrations of U and Th. Radiation effects in titanite are important because this phase is commonly-used for U-Pb age dating of rock formations, and it is also the main crystalline constituent of certain glass-ceramic nuclear waste forms. Previous work suggested that titanite is highly susceptible to natural alpha-decay-induced amorphization, but ion irradiation experiments have so far been reported only at room temperature. In this work, the first temperature-dependent amorphization data for titanite are reported. High-purity single-crystal specimens from the Khan Mine, Namibia were characterized by analytical electron microscopy and powder XRD. Suitable specimens were then irradiated in-situ at the IVEM Facility using 800 keV Kr ions at temperatures ranging from 30 to 1100 K. Conventional imaging and diffraction techniques were used to monitor the transformation to the amorphous state. Titanite was amorphized at a relatively low dose over the entire temperature range investigated. Limited crystallization of ion-beam-amorphized titanite was observed at temperatures above 1100 K.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 650: Symposium R – Microstructural Processes in Irradiated Materials-2000 , 2000 , R3.46
Copyright
Copyright © Materials Research Society 2001

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References

REFERENCES

1. Heaman, L. and Parrish, R.R., in Applications of Radiogenic Isotope systems to Problems in Geology. Mineralogical Association of Canada Short Course Handbook Vol. 19 (Mineralogical Association of Canada, Toronto, 1991) pp. 59–102.Google Scholar
2. Zachariasen, W.H., Zeit. Krist. 73, 7 (1930).Google Scholar
3. Mongiorgi, R. and Sanseverino, R. de, Mineralogica et Petrographica Acta 14, 123 (1968).Google Scholar
4. Taylor, M. and Brown, G.E., Am. Mineral. 61, 435 (1976).Google Scholar
5. Higgins, J.B. and Ribbe, P.H., Am. Mineral. 61, 878 (1976).Google Scholar
6. Cerny, P. and Povandra, P., Neues Jahrb. Mineral. Monatsh. 400 (1972).Google Scholar
7. Cerny, P. and Sanseverino, R. de, Neues Jahrb. Mineral. Monatsh. 97 (1972).Google Scholar
8. Hayward, P.J. and Checchetto, E.V., In Topp, S.V. ( Ed.) Scientific Basis for Nuclear Waste Management (Elsevier, NY, 1982) pp. 91–98.Google Scholar
9. Hayward, P.J., Vance, E.R., Cann, C.D., and Mitchell, S.L., In Wicks, G.G. and Ross, W.A. (Eds.) Advances in Ceramics (Am. Ceram. Soc., Westerville, OH, 1984) pp. 291–301.Google Scholar
10. Vance, E.R. and Metson, J.B., Phys. Chem. Mineral. 12, 255 (1985).Google Scholar
11. Fleet, M.E. and Henderson, G.S. Mat. Res. Soc. Symp. Proc. 50, 363 (1985).Google Scholar
12. Lumpkin, G.R., Eby, R.K., and Ewing, R.C., J. Mater. Res. 6, 560 (1991).Google Scholar
13. Hawthorne, F.C., Groat, L.A., Raudsepp, M., Ball, N.A., Kimata, M., Spike, F.D., Gaba, R., Halden, N.M., Lumpkin, G.R., Ewing, R.C., Greegor, R.B., Lytle, F.W., Ercit, T.S., Rossman, G.R., Wicks, F.J., Ramik, R.A., B.Ll Sherriff, Fleet, M.E., and McCammon, C., Am. Mineral. 76, 370 (1991).Google Scholar
14. Chrosch, J., Colombo, M., Malcherek, T., Salje, E.K.H., Groat, L.A., and Bismayer, U.. Am. Mineral. 83, 1083 (1998).Google Scholar
15. Vance, E.R., Karioris, F.G., Cartz, L., and Wong, M.S., In Advances in Ceramics Volume 8, edited by Wicks, G.G. and Ross, W.A. (American Ceramic Society, Westerville, OH, 1984) pp.62–70.Google Scholar
16. Ziegler, J.F., SRIM, (IBM Research, Yorktown NY, 1999).Google Scholar
17. Meldrum, A., White, C.W., Keppens, V., Boatner, L.A., and Ewing, R.C., Phys. Rev. B (in press).Google Scholar
18. Meldrum, A., Boatner, L.A., Ewing, R.C., and Weber, W.J.. Phys. Rev. B (submitted).Google Scholar
19. Weber, W.J., Nucl. Instr. Meth. 166, 98 (2000).Google Scholar