Structure of refilled metastable water ice XVII
Very recently, by means of X-ray and neutron diffraction, we have studied the crystalline structure of C0-phase H2-filled-ice and ice XVII, a new form of ice discovered by our group. Of paramount interest is the fact that this new ice (obtained by heating C0-phase H2-filled-ice at about 110 K under dynamic vacuum) is so porous that it can absorb again H2 and release it repetitively. After our first diffraction measurements some issues remain still unresolved. This proposal aims to study the structure of this new compound, ice XVII, both empty and with various quantities of refilled D2, Ne and O2, by means of neutron diffraction so to give an answer to the open problems about the effect of the guest on the structure. Data will be analyzed through Rietveld refinement, so to accurately determine the positions of the atoms in the unit cell. This system might have a relevance from the perspective of new materials suitable for H2 storage applications, since it can contain a large amount of H2. Moreover, studying the diffraction of ice XVII refilled with paramagnetic oxygen gas, we aim to investigate the existence of a possible magnetic order due to guest molecules inside the channels.
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Lorenzo Ulivi; CATTI Michele; CELLI Milva; COLOGNESI Daniele; DEL ROSSO Leonardo; GRAZZI Francesco and Thomas C. Hansen. (2018). Structure of refilled metastable water ice XVII. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-22-759
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