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High-pressure crystallography of methane: a low-temperature neutron diffraction study in the 1–5GPa range

By H.E. Maynard, J.S. Loveday, S. Klotz, C.L. Bull and T.C. Hansen

Abstract

International audienceWe report the preliminary results of our recent low-temperature, high-pressure neutron diffraction study of deuterated methane. Contrary to earlier spectroscopic studies of hydrogenous methane, we find no evidence of any structural change between 1 and 5GPa at 25K and show that the diffraction patterns can be indexed and refined with the room temperature high-pressure structure of phase A. Our results suggest that either methane shows a remarkably strong isotopic effect or the spectroscopic changes observed are not indicative of structural phase transitions

Topics: high-pressure, methane, structure, [ PHYS.COND.CM-GEN ] Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other]
Publisher: Taylor & Francis
Year: 2009
DOI identifier: 10.1080/08957950802570459
OAI identifier: oai:HAL:hal-00545210v1
Provided by: Hal-Diderot
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