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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


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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