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Sano, Asami; Komatsu, Kazuki*; Kuribayashi, Takahiro*; Yagi, Takehiko*; Otani, Eiji*
no journal, ,
New neutron diffraction beamline for high pressure experiment is under construction at MLF, J-PARC and will be available soon. In this paper, I will present examples of neutron diffraction studies on hydrous and nominally anhydrous minerals to show a potential utility of neutron diffraction in the investigation of high pressure mineral physics. (1) Emboss hydrogen in mineral; Neutron scattering length of hydrogen (deuterium) is sufficient compared to the main constituent of minerals, thus neutron diffraction is a powerful tool to investigate the hydrogen in minerals. I will present the result of neutron diffraction study on nominally anhydrous mineral of wadsleyite. (2) Distinguish Isotopes; Another characteristic property of neutron scattering is an ability to distinguish isotopes. Neutron diffraction on 
-AlOOH and -AlOOD shows the strong isotope effects on the geometry of hydrogen bond.
Sano, Asami; Hattori, Takanori; Arima, Hiroshi*; Utsumi, Wataru
no journal, ,
Neutron diffraction is a powerful tool to investigate hydrogen in minerals and rocks. New neutron diffraction beamline "PLANET" is currently under construction at BL11 of Materials and Life Science Experimental Facility (MLF) at J-PARC, at Tokai, Ibaraki. One of the unique features of the beamline is that 6-rams multi-anvil apparatus (ATSUHIME) is planned to be installed, to generate high pressure and high temperature conditions of earth's mantle. I will present the current status of PLANET and 6-rams multi-anvil apparatus.
Katayama, Yoshinori; Yagafarov, O.; Ikeda, Takashi; Saito, Hiroyuki; Aoki, Katsutoshi; Hattori, Takanori; Fukui, Hiroshi*; Tange, Yoshinori*; Funakoshi, Kenichi*
no journal, ,
Liquid water at ambient pressure shows unique properties and they are related to the network structure formed by hydrogen bonds between water molecules. To study structural change in the liquid water under high-pressure and high-temperature conditions, we have measured X-ray diffraction of liquid water just above the melting line up to 20 GPa. Up to 4 GPa, the coordination number increased rapidly while the intermolecular distance changed slightly. First-principles molecular dynamics simulations were also performed for high-density water. Results of the simulations in a wide pressure- temperature range revealed that temperature was more important factor for the crossover between the hydrogen-bonded and simple liquid-like liquids. We have measured X-ray diffraction of water as a function of temperature. The experimental results supported the results of the simulation.