Hostname: page-component-78c5997874-g7gxr Total loading time: 0 Render date: 2024-11-06T04:15:48.058Z Has data issue: false hasContentIssue false
  • English
  • Français

Study of the Metamict Transformation in α-Quartz Using High-Resolution Electron Microscopy and Convergent Beam Electron Diffraction

Published online by Cambridge University Press:  15 February 2011

M. R. Pascucci ,
J. L. Hutchison  and
L. W. Hobbs
M. R. Pascucci
Affiliation:
Department of Metallurgy and Materials Science, Case Western Reserve University, Cleveland, Ohio 44106
J. L. Hutchison
Affiliation:
Department of Metallurgy and Science of Materials, University of Oxford, Oxford, OXI 3PH, U.K.
L. W. Hobbs
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
Get access

Abstract

The metamict transformation under electron irradiation has been studied in α-quartz using transmission electron microscopy (TEM) and convergent-beam electron diffraction (CBD). The transformation occurs in two stages: heterogeneous nucleation of discrete disordered inclusions and a slower homogeneous loss of crystalline order in the surrounding matrix. Both features are attributable to solidstate radiolysis, a mechanism for which is proposed. Ultrahigh resolution TEM structure images and information from zeroth and high order Laue zones in CBD confirm that shortrange correlations are the first to be lost and that longerrange correlations persist well into the metamict transformation. A transformation model is advanced in which progressive disorder evolves from small displacements of individual [SiO4] coordination units, made possible by lowered connectivity, within a framework of long-range ordered material.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 6: Symposium D – Scientific Basis for Nuclear Waste Management IV , 1981 , 689
Copyright
Copyright © Materials Research Society 1982

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Broegger, W. C., Salm. Store Illustr. Konvers. 1, 742–3 (1893).Google Scholar
2. Pabst, A., Amer. Mineralogist 37, 137–57 (1952).Google Scholar
3. Cockayne, D. J. H., Z. Naturforsch. 27a, 452 (1972).Google Scholar
4. Spence, J. C. H., Experimental High Resolution Electron Microscopy, Clarendon Press, Oxford, 1980.Google Scholar
5. Steeds, J. W., Introduction to Analytical Electron Microscopy, ed. Hren, J. J., Goldstein, J. I. and Joy, D. C. (Plenum, New York, 1979), 387–422.Google Scholar
6. Hobbs, L. W., J. Amer. Ceram. Soc. 62, 267–78 (1979).Google Scholar
7. Das, G. and Mitchell, T. E., Rad. Effects 23, 49–52 (1974).Google Scholar
8. Hobbs, L. W. and Pascucci, M. R., J. Physique 41 (C6), 237–42 (1980).Google Scholar
9. Hutchinson, J. L., Jenkins, M. L., Hirsch, P. B. and White, S., Nature 287, 314–16 (1980).Google Scholar
10. Carter, C. B. and Kohlstedt, D. L., Phys. Chem. Minerals 7, 110–16 (1981).Google Scholar
11. Hobbs, L. W., ref. [5], 437–80.Google Scholar
12. Howie, A. and Basinski, Z. S., Phil. Nag. 17, 1039–63 (1968).Google Scholar
13. Hobbs, L. W., Defects and their Structure in Non-Metallic Solids, ed. Henderson, B. and Hughes, A. E. (Plenum, New York, 1976), 431–82.Google Scholar
14. Ardell, A. J., Christy, J. M. and McCormick, J. W., Phil. Mag. 29, 1399–1411.Google Scholar
15. Griscom, D. L., Proc. 33rd Freq. Control Symposium [30 May - 1 June 1979] (Electronic Industries Assn., Washington, D.C., 1979), 98–109.Google Scholar
16. Fowler, W. B., ‘Theory of strongly relaxed point defects in oxides,’ Rad. Effects (in press, 1981).Google Scholar
17. Yip, K. L. and Fowler, W. B., Phys. Rev. B11, 2327–38 (1975).Google Scholar
18. Cooper, A. R., Phys. Chem. Glasses 19, 60–69 (1978).Google Scholar
19. Van den Bosch, A., Rad. Effects 8, 49–50 (1971).Google Scholar
20. Primak, W., Phys. Rev. 110, 1240–54 (1958).Google Scholar
21. Comes, R., Lambert, M. and Guinier, A., Interaction of Radiation with Solids, ed. Bishay, A. (Plenum, New York, 1967), 319–39.Google Scholar