Skip to main content Accessibility help
×
Home

Chemical Composition, Geochemical Alteration, and Radiation Damage Effects in Natural Perovskite

  • Gregory R. Lumpkin (a1), Michael Colella (a1), Katherine L. Smith (a1), Roger H. Mitchell (a2) and Alf Olav Larsen (a3)...

Abstract

Preliminary analytical and transmission electron microscopy (AEM and TEM) results for a small suite of natural perovskites are reported in this paper and discussed in relation to previous work. We show that perovskite compositions in Synroc and tailored ceramics plot within the known fields of natural perovskite compositions. AEM analyses and electron diffraction work on selected samples indicate that they are predominantly stoichiometric variants of the cubic perovskite structure. Geochemical alteration was observed in one sample of loparite from Bratthagen, Norway. The primary result of this alteration was leaching of Na from the A-site. Although sufficient alpha-decay dose levels for complete amorphization are not realized in this suite of samples, the available data bracket the beginning of the crystalline-amorphous transformation at doses that are ∼ 2-4 times greater than those of zirconolite of similar age. These results may be due to fundamental differences in the damage annealing rates of perovskite and zirconolite.

Copyright

References

Hide All
1 Ringwood, A.E., Kesson, S.E., Reeve, K.D., Levins, D.M., and Ramm, E.J., in Radioactive Waste Forms for the Future, edited by Lutze, W. and Ewing, R.C. (Elsevier, New York, 1988) p. 233.
2 Harker, A.B., in Radioactive Waste Forms for the Future, edited by Lutze, W. and Ewing, R.C. (Elsevier, New York, 1988) p. 335.
3 Lumpkin, G.R., Smith, K.L., and Blackford, M.G., J. Mater. Res. 6, 2218 (1991).
4 Smith, K.L., Lumpkin, G.R., Blackford, M.G., Day, R.A., and Hart, K.P., J. Nucl. Mater. 190, 287 (1992).
5 Lumpkin, G.R., Smith, K.L., and Blackford, M.G., J. Nucl. Mater. 224, 31 (1995).
6 Smith, K.L., Blackford, M.G., Lumpkin, G.R., Hart, K.P., and Robinson, B.J., in Scientific Basis for Nuclear Waste Management XIX, edited by Murphy, W.M. and Knecht, D.A. (Mater. Res. Soc. Proc. 412, Pittsburgh, PA, 1996) pp. 313319.
7 Mosley, W.C., J. Amer. Ceram. Soc. 54, 475 (1971).
8 Clinard, F.W. Jr., Rohr, D.L., and Roof, R.B., Nucl. Instr. Meth. Phys. Res. B1, 581 (1984).
9 Weber, W.J., Wald, J.W., and Matzke, Hj., J. Nucl. Mater. 138, 196 (1986).
10 White, T.J., Ewing, R.C., Wang, L.M., Forrester, J.S., and Montross, C., in Scientific Basis for Nuclear Waste Management XVIII, edited by Murakami, T. and Ewing, R.C. (Mater. Res. Soc. Proc. 353, Pittsburgh, PA, 1995) pp. 14131420.
11 Smith, K.L., Zaluzec, N.J., and Lumpkin, G.R., J. Nucl. Mater., in press.
12 Lumpkin, G.R., Smith, K.L., Blackford, M.G., Gieré, R., and Williams, C.T., Micron 25, 581 (1994).
13 Lumpkin, G.R., Smith, K.L., and Gieré, R., Micron 28, 57 (1997).
14 Mitchell, R.H., in Rare Earth Minerals, edited by Jones, A.P., Wall, F.W., and Williams, C.T. (Chapman and Hall, London, 1996) p. 41.
15 Ryerson, F.J., J. Amer. Ceram. Soc. 67, 75 (1984).
16 Hawkins, K.D. and White, T.J., Phil. Trans. R. Soc. Lond. A 336, 541 (1991).
17 White, T.J., Segall, R.L., Barry, J.C., and Hutchison, J.L., Acta Cryst. B41, 93 (1985).
18 Lumpkin, G.R., Hart, K.P., McGlinn, P.J., Payne, T.E., Gieré, R., and Williams, C.T., Radiochim. Acta 66/67, 469 (1994).
19 Lumpkin, G.R., Smith, K.L., Blackford, M.G., Gieré, R., and Williams, C.T., in Scientific Basis for Nuclear Waste Management XXI, in press.
20 Vance, E.R., Day, R.A., Zhang, Z., Begg, B.D., Ball, C.J., and Blackford, M.G., J. Sol. St. Chem. 124, 77 (1996).
21 Nesbitt, H.W., Bancroft, G.M., Fyfe, W.S., Karkhanis, S.N., and Nishijima, A., Nature 289, 358 (1981).
22 Mariano, A.N., in Geochemistry and Mineralogy of Rare Earth Elements, edited by Lipin, B.R. and McKay, G.A. (Mineralogical Society of America, Washington, D.C., 1989) p. 309.
23 Lumpkin, G.R., Smith, K.L., and Blackford, M.G., in Scientific Basis for Nuclear Waste Management XVIII, edited by Murakami, T. and Ewing, R.C. (Mater. Res. Soc. Proc. 353, Pittsburgh, PA, 1995) pp. 855862.

Chemical Composition, Geochemical Alteration, and Radiation Damage Effects in Natural Perovskite

  • Gregory R. Lumpkin (a1), Michael Colella (a1), Katherine L. Smith (a1), Roger H. Mitchell (a2) and Alf Olav Larsen (a3)...

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed