Article abstract
Nature Materials 4, 851 - 854 (2005)
doi:10.1038/nmat1511
Subject Categories: Glasses | Characterisation and analytical techniques
Probing of bonding changes in B2O3 glasses at high pressure with inelastic X-ray scattering
Sung Keun Lee1, Peter J. Eng2,3, Ho-kwang Mao4,5, Yue Meng4,5, Matthew Newville2, Michael Y. Hu5 and Jinfu Shu4
Abstract
Full understanding of atomic arrangement in amorphous oxides both at ambient and high pressure is an ongoing fundamental puzzle. Whereas the structures of archetypal oxide glasses such as v-B2O3 at high pressure are essential to elucidate origins of anomalous macroscopic properties of more complex melts, knowledge of the high-pressure structure and pressure-induced coordination changes of these glasses has remained elusive due to lack of suitable in situ experimental probes. Here, we report synchrotron inelastic X-ray scattering results for v-B2O3 at pressures up to 22.5 GPa, revealing the nature of pressure-induced bonding changes and the structure. Direct in situ measurements show a continuous transformation from tri-coordinated to tetra-coordinated boron beginning at 4–7 GPa with most of the boron tetra-coordinated above 20 GPa, forming dense tetrahedral v-B2O3. After decompression from high pressure the bonding reverts back to tri-coordinated boron but with the data suggesting a permanent densification.
- School of Earth and Environmental Sciences, Seoul National University, Seoul, 151-742, Korea
- Consortium for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637, USA
- James Franck Institute, University of Chicago, Chicago, Illinois 60637, USA
- Geophysical Laboratory, Carnegie Institution of Washington, Washington DC, 20015, USA
- HPCAT, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
Correspondence to: Sung Keun Lee1 e-mail: sungklee@snu.ac.kr
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