Earth materials under extreme environments: Insights from synchrotron Inelastic X-rays
We have identified the detailed structural origins of densification in diverse earth materials (both crystalline and non-crystalline) using recently developed synchrotron inealstic x-ray scattering techniques. These studies allows us to constrain geophysical and geochemical evolutions of earth's primitive mantle and those involving super-Earth bodies.
Figure| (left) Experimental and calculated oxygen K-edge XRS spectra for amorphous and crystalline silica up to 160 GPa (from Lee SK et al. PRL 2019); (right) Changes in the average oxygen coordination number (CO) and Ec of SiO2 glass up to 160 GPa. The CO values are calculated from the average silicon coordination numbers (CSi) from previous studies. Schematics of the oxygen configurations with varying coordination numbers (top) and ultra-low velocity zone (ULVZ) at the lower mantle are shown (From Lee et al. PRL 2019).
Figure| (left) Experimental and calculated oxygen K-edge XRS spectra for amorphous and crystalline silica up to 160 GPa (from Lee SK et al. PRL 2019); (right) Changes in the average oxygen coordination number (CO) and Ec of SiO2 glass up to 160 GPa. The CO values are calculated from the average silicon coordination numbers (CSi) from previous studies. Schematics of the oxygen configurations with varying coordination numbers (top) and ultra-low velocity zone (ULVZ) at the lower mantle are shown (From Lee et al. PRL 2019).
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Lee, S. K., Kim, Y.-H., Yi, Y. S., Chow, P., Xiao, Y., Ji, C., & Shen, G., Oxygen quadclusters in SiO2 glass above megabar pressures up to 160 GPa revealed by X-ray Raman scattering. Physical Review Letters 123 235701 (2019) –selected as editor’s suggestion
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Fu, S., Yang, J., Zhang, Y., Okuchi, T., McCammon, C., Liu, J., Kim, H.-I., Lee, S. K., Lin, J.-F., Abnormal elasticity of Fe-bearing bridgmanite in the earth’s lower mantle. Geophysical Research Letters 45 4725-4732 (2018)
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Lee, S. K., Lin, J.-F., Cai, Y. Q., Hiraoka, N., Eng, P. J., Okuchi, T., Mao, H., Meng, Y., Hu, M. Y., Chow, P., Shu, J., Li, B., Fukui, H., Lee, B. H., Kim, H. N., Yoo, C. S., X-ray Raman scattering study of MgSiO3 glass at high pressure: Implication for triclustered MgSiO3 melt in Earth's mantle. Proceedings of the National Academy of Sciences 105 7925-7929 (2008)
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Lee, S. K., Eng, P., Mao, H. K., Meng, Y., Newville, M., Hu, M. Y., Shu, J., Probing of bonding changes in B2O3 glasses at high pressure with inelastic X-ray scattering. Nature Materials 4 851 (2005)
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