Neutron diffraction studies on hydrous and nominally anhydrous minerals

Sano, Asami   ; Komatsu, Kazuki*; Kuribayashi, Takahiro*; Yagi, Takehiko*; Otani, Eiji*

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.