Japan Geoscience Union Meeting 2015

Presentation information


Symbol S (Solid Earth Sciences) » S-MP Mineralogy & Petrology

[S-MP42] Physics and Chemistry of Minerals

Tue. May 26, 2015 2:15 PM - 4:00 PM 102A (1F)

Convener:*Atsushi Kyono(Graduate School of Life and Environmental Sciences, University of Tsukuba), Hiroaki Ohfuji(Geodynamics Research Center, Ehime University), Chair:Atsushi Kyono(Graduate School of Life and Environmental Sciences, University of Tsukuba)

2:45 PM - 3:00 PM

[SMP42-03] X-ray and neutron diffraction experiments on hydrous silica glass under pressure

*Satoru URAKAWA1, Toru INOUE2, Takanori HATTORI3, Asami SANO3, Takumi KIKEGAWA4, Ken-ichi FUNAKOSHI5, Kenji MIBE6, Shinji KOHARA7 (1.Dept Earth Sci, Okayama Univ, 2.GRC, Ehime Univ, 3.J-PARC, JAEA, 4.PF, KEK, 5.CROSS, 6.ERI, Univ Tokyo, 7.JASRI)

Keywords:silicate glass, magma, neutron

We have studied structure of hydrous silica glass by using X-ray and Neutron diffraction experiments up to 10 GPa at ambient temperature. Hydrous silica glass was synthesized by quenching from melts under pressure, which contains 13 wt % of D2O. X-ray diffraction experiments were conducted at BL04B2 of SPring-8 and AR-NE5 of Photon Factory. Neutron diffraction experiments were carried out at BL11 of MLF, J-PARC. Both X-ray and neutron diffractions show the shift of the FSDP of structure factor toward higher Q with increasing pressure, indicating the shrinkage of the intermediate range order with pressure. The radial distribution functions shows that the SiO4 unit does not change up to 10 GPa but the Si-Si distance decrease with pressure. These also indicate the change of the intermediate range order. D-O distance in the hydrous silica glass is nearly constant, 0.92 Å. The changes of silica framework with pressure in hydrous silica glass are similar to those in dry silica glass.