X-Ray Topographic Studies of Dislocations in Vapor-Grown Ice Crystals
Abstract Ice crystals grown from the vapor under controlled conditions have been examined by X-ray topography. Plates grown in the region — 1.5°C to —3°C and at — 15°C near water saturation were often free of defects, as were plates grown at smaller supersaturations (1.5% at — 3°C, 6% at — 15°C). It...
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Language: | English |
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Cambridge University Press (CUP)
1978
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Online Access: | http://dx.doi.org/10.1017/s0022143000033566 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000033566 |
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crcambridgeupr:10.1017/s0022143000033566 2024-03-03T08:45:59+00:00 X-Ray Topographic Studies of Dislocations in Vapor-Grown Ice Crystals Mcknight, C. V. Hallett, J. 1978 http://dx.doi.org/10.1017/s0022143000033566 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000033566 en eng Cambridge University Press (CUP) Journal of Glaciology volume 21, issue 85, page 397-407 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1978 crcambridgeupr https://doi.org/10.1017/s0022143000033566 2024-02-08T08:40:23Z Abstract Ice crystals grown from the vapor under controlled conditions have been examined by X-ray topography. Plates grown in the region — 1.5°C to —3°C and at — 15°C near water saturation were often free of defects, as were plates grown at smaller supersaturations (1.5% at — 3°C, 6% at — 15°C). It is inferred from these observations that growth was occurring by two-dimensional nucleation on the prism plane. It is suggested that multilayer adsorption on the crystal surface was responsible for growth at the low values of supersaturation, compared with higher values predicted by the Burton—Cabrera—Frank theory. Ice crystals dependent on dislocations for growth could only occur at supersaturations lower than these values. The crystal habit is interpreted as being dependent on differential two-dimensional nucleation on prism or basal faces. Rib structure is often associated with dislocation loops; stacking faults were evident in some crystals. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Burton ENVELOPE(166.733,166.733,-72.550,-72.550) Journal of Glaciology 21 85 397 407 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Mcknight, C. V. Hallett, J. X-Ray Topographic Studies of Dislocations in Vapor-Grown Ice Crystals |
topic_facet |
Earth-Surface Processes |
description |
Abstract Ice crystals grown from the vapor under controlled conditions have been examined by X-ray topography. Plates grown in the region — 1.5°C to —3°C and at — 15°C near water saturation were often free of defects, as were plates grown at smaller supersaturations (1.5% at — 3°C, 6% at — 15°C). It is inferred from these observations that growth was occurring by two-dimensional nucleation on the prism plane. It is suggested that multilayer adsorption on the crystal surface was responsible for growth at the low values of supersaturation, compared with higher values predicted by the Burton—Cabrera—Frank theory. Ice crystals dependent on dislocations for growth could only occur at supersaturations lower than these values. The crystal habit is interpreted as being dependent on differential two-dimensional nucleation on prism or basal faces. Rib structure is often associated with dislocation loops; stacking faults were evident in some crystals. |
format |
Article in Journal/Newspaper |
author |
Mcknight, C. V. Hallett, J. |
author_facet |
Mcknight, C. V. Hallett, J. |
author_sort |
Mcknight, C. V. |
title |
X-Ray Topographic Studies of Dislocations in Vapor-Grown Ice Crystals |
title_short |
X-Ray Topographic Studies of Dislocations in Vapor-Grown Ice Crystals |
title_full |
X-Ray Topographic Studies of Dislocations in Vapor-Grown Ice Crystals |
title_fullStr |
X-Ray Topographic Studies of Dislocations in Vapor-Grown Ice Crystals |
title_full_unstemmed |
X-Ray Topographic Studies of Dislocations in Vapor-Grown Ice Crystals |
title_sort |
x-ray topographic studies of dislocations in vapor-grown ice crystals |
publisher |
Cambridge University Press (CUP) |
publishDate |
1978 |
url |
http://dx.doi.org/10.1017/s0022143000033566 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000033566 |
long_lat |
ENVELOPE(166.733,166.733,-72.550,-72.550) |
geographic |
Burton |
geographic_facet |
Burton |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 21, issue 85, page 397-407 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000033566 |
container_title |
Journal of Glaciology |
container_volume |
21 |
container_issue |
85 |
container_start_page |
397 |
op_container_end_page |
407 |
_version_ |
1792501732683546624 |