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Updated: Jul 16, 2026

High Pressure Single Crystal Diffraction at PX^2
Published on: January 16, 2017
Structure of alkali borate glasses at high pressure: B and Li K-edge inelastic X-ray scattering study
Sung Keun Lee1, Peter J Eng, Ho-kwang Mao
1School of Earth and Environmental Sciences, Seoul National University, Seoul, 151-742 Korea. sungklee@snu.ac.kr
Abstract:
We report the first in situ boron K-edge inelastic x-ray scattering (IXS) spectra for alkali borate glasses (Li2B4O7) at high pressure up to 30 GPa where pressure-induced coordination transformation from three-coordinated to four-coordinated boron was directly probed. Coordination transformation (reversible upon decompression) begins around 5 GPa and the fraction of four-coordinated boron increases with pressure from about 50% (at 1 atm) to more than 95% (at 30 GPa) with multiple densification mechanisms, evidenced by three distinct pressure ranges for (d[4]B/dP)T. The lithium K-edge IXS spectrum for Li-borate glasses at 5 GPa shows IXS features similar to that at 1 atm, suggesting that the Li environment does not change much with pressure up to 5 GPa. These results provide improved understanding of the structure of low-z glass at high pressure.
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