Structural stability of methane hydrate at high pressures
The structural stability of methane hydrate under pressure at room temperature was examined by both in-situ single-crystal and powder X-ray diffraction techniques on samples with structure types I, II, and H in diamond-anvil cells. The diffraction data for types II (sII) and H (sH) were refined to t...
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ftdoajarticles:oai:doaj.org/article:a637416fd55044859dd689a310d6fd15 2023-10-09T21:53:28+02:00 Structural stability of methane hydrate at high pressures Jinfu Shu Xiaojia Chen I.-Ming Chou Wenge Yang Jingzhu Hu Russell J. Hemley Ho-kwang Mao 2011-01-01T00:00:00Z https://doi.org/10.1016/j.gsf.2010.12.001 https://doaj.org/article/a637416fd55044859dd689a310d6fd15 EN eng Elsevier http://www.sciencedirect.com/science/article/pii/S1674987110000344 https://doaj.org/toc/1674-9871 1674-9871 doi:10.1016/j.gsf.2010.12.001 https://doaj.org/article/a637416fd55044859dd689a310d6fd15 Geoscience Frontiers, Vol 2, Iss 1, Pp 93-100 (2011) Methane hydrate Structural stability High pressure Geology QE1-996.5 article 2011 ftdoajarticles https://doi.org/10.1016/j.gsf.2010.12.001 2023-09-10T00:48:43Z The structural stability of methane hydrate under pressure at room temperature was examined by both in-situ single-crystal and powder X-ray diffraction techniques on samples with structure types I, II, and H in diamond-anvil cells. The diffraction data for types II (sII) and H (sH) were refined to the known structures with space groups Fd3m and P63/mmc, respectively. Upon compression, sI methane hydrate transforms to the sII phase at 120 MPa, and then to the sH phase at 600 MPa. The sII methane hydrate was found to coexist locally with sI phase up to 500 MPa and with sH phase up to 600 MPa. The pure sH structure was found to be stable between 600 and 900 MPa. Methane hydrate decomposes at pressures above 3 GPa to form methane with the orientationally disordered Fm3m structure and ice VII (Pn3m). The results highlight the role of guest (CH4)-host (H2O) interactions in the stabilization of the hydrate structures under pressure. Article in Journal/Newspaper Methane hydrate Directory of Open Access Journals: DOAJ Articles Anvil ENVELOPE(-64.267,-64.267,-65.239,-65.239) Geoscience Frontiers 2 1 93 100 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Methane hydrate Structural stability High pressure Geology QE1-996.5 |
spellingShingle |
Methane hydrate Structural stability High pressure Geology QE1-996.5 Jinfu Shu Xiaojia Chen I.-Ming Chou Wenge Yang Jingzhu Hu Russell J. Hemley Ho-kwang Mao Structural stability of methane hydrate at high pressures |
topic_facet |
Methane hydrate Structural stability High pressure Geology QE1-996.5 |
description |
The structural stability of methane hydrate under pressure at room temperature was examined by both in-situ single-crystal and powder X-ray diffraction techniques on samples with structure types I, II, and H in diamond-anvil cells. The diffraction data for types II (sII) and H (sH) were refined to the known structures with space groups Fd3m and P63/mmc, respectively. Upon compression, sI methane hydrate transforms to the sII phase at 120 MPa, and then to the sH phase at 600 MPa. The sII methane hydrate was found to coexist locally with sI phase up to 500 MPa and with sH phase up to 600 MPa. The pure sH structure was found to be stable between 600 and 900 MPa. Methane hydrate decomposes at pressures above 3 GPa to form methane with the orientationally disordered Fm3m structure and ice VII (Pn3m). The results highlight the role of guest (CH4)-host (H2O) interactions in the stabilization of the hydrate structures under pressure. |
format |
Article in Journal/Newspaper |
author |
Jinfu Shu Xiaojia Chen I.-Ming Chou Wenge Yang Jingzhu Hu Russell J. Hemley Ho-kwang Mao |
author_facet |
Jinfu Shu Xiaojia Chen I.-Ming Chou Wenge Yang Jingzhu Hu Russell J. Hemley Ho-kwang Mao |
author_sort |
Jinfu Shu |
title |
Structural stability of methane hydrate at high pressures |
title_short |
Structural stability of methane hydrate at high pressures |
title_full |
Structural stability of methane hydrate at high pressures |
title_fullStr |
Structural stability of methane hydrate at high pressures |
title_full_unstemmed |
Structural stability of methane hydrate at high pressures |
title_sort |
structural stability of methane hydrate at high pressures |
publisher |
Elsevier |
publishDate |
2011 |
url |
https://doi.org/10.1016/j.gsf.2010.12.001 https://doaj.org/article/a637416fd55044859dd689a310d6fd15 |
long_lat |
ENVELOPE(-64.267,-64.267,-65.239,-65.239) |
geographic |
Anvil |
geographic_facet |
Anvil |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_source |
Geoscience Frontiers, Vol 2, Iss 1, Pp 93-100 (2011) |
op_relation |
http://www.sciencedirect.com/science/article/pii/S1674987110000344 https://doaj.org/toc/1674-9871 1674-9871 doi:10.1016/j.gsf.2010.12.001 https://doaj.org/article/a637416fd55044859dd689a310d6fd15 |
op_doi |
https://doi.org/10.1016/j.gsf.2010.12.001 |
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Geoscience Frontiers |
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2 |
container_issue |
1 |
container_start_page |
93 |
op_container_end_page |
100 |
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1779316741633998848 |