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Effects of crystallization and plastic flow on the thermoluminescence of ice

  • L. B. Ronca (a1) and E. J. Zeller (a1)

Abstract

Glow-curves of ice, made in the laboratory, have a distribution of peak-height ratios, with the maximum at approximately 0.75. The distribution was probably caused by varying conditions of crystallization, impossible to control with the present equipment. Glow-curves of ice which has been made to flow have a distribution of peak ratios with the maximum at approximately 1.75.

It is concluded that dislocations in the crystal lattice effect the peak ratio. Dislocations are produced during crystallization by internal stresses, and to a greater extent, by external forces during the flow.

Résumé

Les courbes de thermoluminescence de la glace produite en laboratoire ont une distribution de rapports de la hauteur des pics avec un maximum d’environ 0,75. Des conditions variables de cristallisation, impossibles à contrôler avec les moyens actuels, causent probablement cette distribution. Les courbes de thermoluminescence émises par de la glace ayant subi un écoulement, ont une distribution des rapports de la hauteur des pics avec un maximum d’environ 1,75.

On en conclut que les dislocations dans le réseau cristallin influent sur le rapport des pics. Les dislocations sont produites pendant la cristallisation par des forces internes et de façon plus marquée par des forces externes durant l’écoulement.

Zusammenfassung

Das Maximum der Verteilung der Kurvenseheitelpunktsverhältnisse von Glüh-Kurven die an Eis hergestellt im Labor beobachtet wurden, liegt bei etwa 0,75. Diese Verteilung wurde vermutlich durch unterschiedliche Verhältnisse beider Kristallisierung verursacht, die man mit den derzeit vorhanrlcoen Geräien niche kmitiolliercn kann. Glüh-Kurvcn von Eis, das zum Fliessen gebracht worden war, weisen vine Verteilung dcr Kurvenschcitclpunktsvcrhältnisse mit cincm Maximum bei etwa 1,75 auf.

Daraus folgt, class Versetzungen im Kristallgitter das Kurvenscheitelpunktsverhältnis beeinflussen. Sie entstehen während des Kristallisierungsvorganges einmal durch innere Spannungen, in grösserem Ausmass aber durch äussere Kräfte während des Fliessvorganges.

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Copyright

References

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Angino, E. E. 1959. Sume effects of pressure on the thermoluminescence of limestone. Journal of Geophysical Research, Vol. 64, No. 10, p. 163840.
Curie, D. 1963. Luminescence in crystals. Translated by G. F. J. Garlick [and] incorporating later revisions by the author and translator. London, Methuen and Co., Ltd.; New York, John Wiley and Sons, Inc.
Gold, L. W. 1963. Deformation mechanisms in ice. (In Kingery, W. D., ed. Ice and snow; properties, processes, and applications: proceedings of a conference held at the Massachusetts Institute of Technology, February 12–16, 1962. Cambridge, Mass., The M.I.T. Press, p. 827.)
Pounder, E. R. 1963. Crystal growth rates as a function of orientation. (In Kingery, W. D., ed. Ice and snow; properties, Processes, and applications: proceedings of a conference held at the Massachusetts Institute of Technology, February 12–56, 1962. Cambridge, Mass., The M.I.T. Press, p. 22631.)
Steinemann, S. 1954. Results of preliminary experiments on the plasticity of ice crystals. Journal of Glaciology, Vol. 2, No. 16, p. 40413.
Zeller, E. J. Ronca, L. S. 1963. Thermoluminescence techniques in determination of the stress and crystallization history of ice. Journal of Glaciology. Vol. 4, No. 34, p. 45360.

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