Dielectric Behaviour of Ice Microcrystals: A Study Versus Temperature
Abstract Dispersions of ice microcrystals were obtained from the breakdown of supercooling of water-in-oil type emulsions whose disperse phase was either resin-exchanged water or aqueous solutions of NH 4 Cl. Their complex permittivity ε⋆ = ε´–jε˝ was studied versus temperature T, up to the melting...
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Cambridge University Press (CUP)
1979
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Online Access: | http://dx.doi.org/10.1017/s002214300001412x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214300001412X |
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crcambridgeupr:10.1017/s002214300001412x 2024-03-03T08:46:01+00:00 Dielectric Behaviour of Ice Microcrystals: A Study Versus Temperature Boned, Christian Lagourette, Bernard Clausse, Marc 1979 http://dx.doi.org/10.1017/s002214300001412x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214300001412X en eng Cambridge University Press (CUP) Journal of Glaciology volume 22, issue 86, page 145-154 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1979 crcambridgeupr https://doi.org/10.1017/s002214300001412x 2024-02-08T08:40:23Z Abstract Dispersions of ice microcrystals were obtained from the breakdown of supercooling of water-in-oil type emulsions whose disperse phase was either resin-exchanged water or aqueous solutions of NH 4 Cl. Their complex permittivity ε⋆ = ε´–jε˝ was studied versus temperature T, up to the melting point of ice microcrystals, by means of an automatically balancing admittance bridge (General Radio 1680 A) working at 400 Hz and 1 kHz, The plots ε´( T ), ε˝( T ) and ε˝(ε´) reveal that these systems exhibit two distinct dielectric relaxations located on either side of a temperature T m which was found to be equal to about — 20°C in the case of water and lower than — 20°C in the case of aqueous solutions of NH 4 Cl. The relaxation located in the lower temperature range arises from the Debye dipolar absorption of ice while the other one could be related to structural changes occurring within the lattice of ice as T approaches its melting point. These results are consistent with those obtained by investigating versus frequency the dielectric behaviour of ice monocrystals at discrete sub-zero temperatures close to their melting point. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Journal of Glaciology 22 86 145 154 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Boned, Christian Lagourette, Bernard Clausse, Marc Dielectric Behaviour of Ice Microcrystals: A Study Versus Temperature |
topic_facet |
Earth-Surface Processes |
description |
Abstract Dispersions of ice microcrystals were obtained from the breakdown of supercooling of water-in-oil type emulsions whose disperse phase was either resin-exchanged water or aqueous solutions of NH 4 Cl. Their complex permittivity ε⋆ = ε´–jε˝ was studied versus temperature T, up to the melting point of ice microcrystals, by means of an automatically balancing admittance bridge (General Radio 1680 A) working at 400 Hz and 1 kHz, The plots ε´( T ), ε˝( T ) and ε˝(ε´) reveal that these systems exhibit two distinct dielectric relaxations located on either side of a temperature T m which was found to be equal to about — 20°C in the case of water and lower than — 20°C in the case of aqueous solutions of NH 4 Cl. The relaxation located in the lower temperature range arises from the Debye dipolar absorption of ice while the other one could be related to structural changes occurring within the lattice of ice as T approaches its melting point. These results are consistent with those obtained by investigating versus frequency the dielectric behaviour of ice monocrystals at discrete sub-zero temperatures close to their melting point. |
format |
Article in Journal/Newspaper |
author |
Boned, Christian Lagourette, Bernard Clausse, Marc |
author_facet |
Boned, Christian Lagourette, Bernard Clausse, Marc |
author_sort |
Boned, Christian |
title |
Dielectric Behaviour of Ice Microcrystals: A Study Versus Temperature |
title_short |
Dielectric Behaviour of Ice Microcrystals: A Study Versus Temperature |
title_full |
Dielectric Behaviour of Ice Microcrystals: A Study Versus Temperature |
title_fullStr |
Dielectric Behaviour of Ice Microcrystals: A Study Versus Temperature |
title_full_unstemmed |
Dielectric Behaviour of Ice Microcrystals: A Study Versus Temperature |
title_sort |
dielectric behaviour of ice microcrystals: a study versus temperature |
publisher |
Cambridge University Press (CUP) |
publishDate |
1979 |
url |
http://dx.doi.org/10.1017/s002214300001412x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214300001412X |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 22, issue 86, page 145-154 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s002214300001412x |
container_title |
Journal of Glaciology |
container_volume |
22 |
container_issue |
86 |
container_start_page |
145 |
op_container_end_page |
154 |
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1792501821809360896 |