In-situ Single-Crystal Neutron Diffraction on Hydrogen Related High-Pressure Compounds at High-Pressure

Details In-situ Single-Crystal Neutron Diffraction on Hydrogen Related High-Pressure Compounds at High-Pressure In-situ Single-Crystal Neutron Diffraction on Hydrogen Related High-Pressure Compounds at High-Pressure

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmmr72a1022x&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #MR72A-1022

Physics

Condensed Matter

0343 Planetary Atmospheres (5405, 5407, 5409, 5704, 5705, 5707), 0345 Pollution: Urban And Regional (0305), 0350 Pressure, Density, And Temperature, 0394 Instruments And Techniques, 0399 General Or Miscellaneous

Scientific paper

The hydrogen bonding at high densities is of great interest to Earth sciences, condensed matter physics, planetary astronomy, and energy application. Using the large size diamond anvil cell (DAC) and recent developed moissanite anvil cell (MAC) [1], we will now be able to conduct high-quality in-situ neutron-diffraction measurements on single crystals at high pressure. This is a unique development of great promise that will open up a wide exciting and completely new area of ultrahigh-pressure research. We have started the neutron diffraction studies on the crystal structures, particularly the hydrogen positions and bond lengths, of the novel solids: D2(D2O)6, DKDP and the methane hydrate CH4-H2O s-II phase at high-pressures. The results shall reveal the first ever-detailed structural information on such solids, and the hydrogen molecule, under such high-pressure conditions. Two new phases (sII and sH) of methane hydrates were recently discovered and their unit cell parameters were determined by single-crystal X-ray diffraction, but the crystal structures have not been determined. A single-crystal of the methane hydrate sII phase with a volume of 1.8mm3 with the excess H2O fluid has been grown in a MAC. A series single crystal diffraction peaks have been identified from both X-ray (in X-17C, BNL) and neutron diffraction (in SCD, LANSCE) measurements recently. Without actual determinations of the hydrogen positions, even the most basic crystallographic information is still uncertain. The in-situ single-crystal neutron diffraction provide a unique way to resolve these novel structures, unequivocally. They will also provide key answers to the behaviors of hydrogen at the extreme pressure conditions. [1] Xu, J. and H.K. Mao, Science 290, 783, 2000.

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