Journal
CHEMICAL PHYSICS LETTERS
Volume 800, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.cplett.2022.139679
Keywords
Clathrate hydrate; Ethane; Crystal structure; Phase transition; Neutron diffraction
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Neutron diffraction measurements revealed a significant structural change in deuterated ethane hydrate below 30K, resulting in a new hexagonal crystal structure with ordered ethane molecules.
Ethane hydrate, a natural gas hydrate, has been considered to only have a cubic symmetry known as structure I. Neutron diffraction measurement of deuterated ethane hydrate was performed from 10 K to 150 K. The diffraction patterns of deuterated ethane hydrate drastically changed below 30 K. A new hexagonal crystal structure with ordered ethane molecules was found as a clathrate hydrate structure. This phase transition was concerned with the thermal motion of the ethane molecules.
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