Structural systematics in the clathrate hydrates under pressure

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Journal titleCanadian Journal of Physics
Pages539544; # of pages: 6
AbstractWe report the results of synchrotron X-ray and neutron diffraction studies of methane, argon, nitrogen, and xenon clathrate hydrates at high pressure and room temperature. The results reveal common features in the structural transition sequences. All phases transform initially to the hexagonal clathrate structure and all except xenon hydrate eventually form an orthorhombic dihydrate. Argon and nitrogen hydrates adopt the type-II clathrate structure at low pressures and have a tetragonal cage structure between the hexagonal and orthorhombic phases. At normal compression rates, the hexagonal form of xenon hydrate decomposes into ice and xenon at ~2.5 GPa. PACS Nos.: 61.50Ks, 61.10-i, 61.12ExNous rapportons ici les r�sultats d'une �tude par rayonnement X synchrotron et par diffusion de neutrons sur des hydrates clathrates de m�thane, d'argon, d'azote et de x�non � haute pression et � la temp�rature de la pi�ce. Les r�sultats r�v�lent des caract�ristiques communes dans les s�quences de transition de structure. Toutes les phases se transforment d'abord en structure clathrate hexagonale et toutes, sauf l'hydrate de x�non, �ventuellement forment des dihydrates orthorhombiques. Les hydrates d'argon et d'azote adoptent la structure clathrate de type II � basse pression et ont une structure de cage t�tragonale entre les phases hexagonale et orthorhombique. � des taux normaux de compression, l'hydrate hexagonal de x�non se d�compose en glace plus du x�non � ~2,5 GPa.[Traduit par la R�daction]
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AffiliationNational Research Council Canada; NRC Steacie Institute for Molecular Sciences
Peer reviewedNo
NPARC number12328506
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Record identifier3b775407-0742-4f16-86a0-b3b0391f17bb
Record created2009-09-10
Record modified2016-05-09
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