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A Direct Determination of an Upper Limit for the Electrical Charge on Dislocations in Ice*

  • D.M. Joncich (a1), J. Holder (a2) and A.V. Granato (a1)

Abstract

A direct determination of the upper limit for the electric charge density along dislocations in ice has been carried out by measuring the simultaneous effects of an electric field and a mechanical stress on the movement of a low-angle tilt boundary in an ice single crystal. The determination is independent of the geometry of the dislocations or the distribution of the charge along them. No measurable effects of the electric field on boundary motion were found, requiring that the charge density be less than one unit of charge for every 300 atomic lengths of dislocation. This estimate is less than large previous estimates, but is consistent with smaller proposed values.

Résumé

Pour déterminer directement la limite supérieure de la charge électrique le long des dislocations de la glace, ou a mesuré les effets simultanés d'un champ électrique et d'une contrainte mécanique sur le mouvement d'une face de faible inclinaison dans un monocristal de glace. La mesure ne dépend pas de la géométrie des dislocations ni de la distribution des charges électriques le long d'elles. Ou n'a pas trouvé d'effet mesurable du champ électrique sur le mouvement de la face tant que la charge était inférieure à une unité pour 300 longueurs de dislocation. Cette estimation est inférieure aux fortes valeurs avancées antérieurement, mais corrobore des évaluations proposées plus faibles.

Zusammenfassung

Die obere Grenze für die elektrische Ladungsdichte entlang von Versetzungen in Eis wurde durch die gleichzeitige Messung der Wirkungen eines elektrischen Feldes und einer mechanischen Spannung auf die Bewegung einer schwach geneigten Grenzfläche in einem Eis-Einkristall direkt bestimmt. Die Bestimmung ist unabhängig von der Geometrie der Versetzungen oder von der Ladungsverteilung längs dieser Versetzungen. Es ergaben sich keine messbaren Effekte des elektrischen Feldes auf die Bewegung der Grenzfläche, sofern die Ladungsdichte geringer als eine Ladungseinheit für je 300 atomare Versetzuugseinheiten war. Diese Schätzung liegt unter den höheren Werten, die früher vorausgesetzt wurden, stimmt jedoch mit den Annahmen kleinerer Werte überein.

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Copyright

Footnotes

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*

This research was supported in part by the National Science foundation under contract DMR-76-01058 and DMR-77-10556.

Footnotes

References

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Higashi, A., and Sakai, N. 1961. Movement of small angle boundary of ice. Journal of the Faculty of Science, Hokkaido University, Ser. 2, Vol. 5, No. 5, p. 221-37.
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A Direct Determination of an Upper Limit for the Electrical Charge on Dislocations in Ice*

  • D.M. Joncich (a1), J. Holder (a2) and A.V. Granato (a1)

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