Hydrogen filled-ices under planetary conditions
High-pressure hydrogen clathrates can be found in the outer solar system (comets, satellites of the gas giant planets, Mars), and could play a major role as gas storage systems due to the very high H2 ratio 1H2O:1H2 . Up to date, only few structural and some Raman characterizations have been carried on these spatial abundant gas hydrates under HP, while no information is available on the the guest-cage dynamics under pressures in the GPa range. In the frame of our LTP n 57755 we will address the exciting program of characterizing hydrogen diffusive and rotational dynamics in filled ice hydrates under the pressure relevant for ice bodies in our solar system, by QENS studies under high pressure employing a newly developed HP apparatus for QENS. Preliminary to these measurements, precise structural measurements are needed to characterize the filling ratio of the in-situ produced clathrate and monitoring its structural evolution as a function of pressure. Here we apply for 4 days of beamline on the high flux diffractmeter D20 to perform such structural analysis of D2:D2O clathrates directly synthesized in situ in the PE press by means of a new hydrogen loader recently installed at ILL.
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BOVE Livia Eleonora; Thomas C. Hansen; KLOTZ Stefan; KUHS Werner Friedrich and RANIERI Umbertoluca. (2015). Hydrogen filled-ices under planetary conditions. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-24-560
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