title: Structure of B2O3 Glass at High Pressure: A 11B Solid-State NMR Study.
abstract: We report spectroscopic evidence for the pressure-induced structural changes in B2O3 glass quenched from melts at pressures up to 6 GPa using solid-state NMR. While all borons are tri-coordinated at 1 atm, the fraction of tetra-coordinated boron increases with pressure, being about 5% and 27% in the B2O3 glass quenched from melts at 2 and 6 GPa, respectively. The fraction of boroxol ring species increases with pressure up to 2 GPa and apparently decreases with further compression up to 6 GPa. Two densification mechanisms are proposed to explain the variation of boron species with pressure.
authors.affiliation: School of Earth and Environmental Sciences, Seoul National University, Seoul, 151-742 Korea. sungklee@snu.ac.kr
authors.forename: Sung Keun
authors.initials: SK
authors.lastname: Lee
authors.forename: Kenji
authors.initials: K
authors.lastname: Mibe
authors.forename: Yingwei
authors.initials: Y
authors.lastname: Fei
authors.forename: George D
authors.initials: GD
authors.lastname: Cody
authors.forename: Bjorn O
authors.initials: BO
authors.lastname: Mysen