Journal of Geophysical Research: Planets, 122, 839–855. (2017) Characterizing amorphous silicates in extraterrestrial materials: Polymerization effects on Raman and mid-IR spectral features of alkali and alkali earth silicate glasses. Proceedings of the National Academy of Sciences of the United States of America, 104, 9182–9186. (2007) Toward an internally consistent pressure scale. 10.1103/PhysRevB.78.104102 Suche in Google Scholarįei, Y., Ricolleau, A., Frank, M., Mibe, K., Shen, G., and Prakapenka, V. (2008) Compression curves of transition metals in the Mbar range: Experiments and projector augmented-wave calculations. 10.1016/j.jnoncrysol.2011.02.045 Suche in Google Scholarĭewaele, A., Torrent, M., Loubeyre, P., and Mezouar, M. Journal of Non-Crystalline Solids, 357, 2787–2795. (2011) Structural investigations of magnesium silicate glasses by 29Si 2D Magic-Angle Flipping NMR. 10.1103/PhysRevB.83.224204 Suche in Google Scholarĭavis, M.C., Sanders, K.J., Grandinetti, P.J., Gaudio, S.J., and Sen, S. (2011) Mg coordination in a MgSiO 3 glass using neutron diffraction coupled with isotopic substitution. (1999) Estimates of mantle relevant Clapeyron slopes in the MgSiO 3 system from high-pressure spectroscopic data. (2005) 142Nd evidence for early (>4.53 Ga) global differentiation of the silicate Earth. Journal of Non-Crystalline Solids, 357, 2632–2636. (2011) High pressure X-ray diffraction measurements on Mg 2SiO 4 glass. 10.1103/PhysRevB.81.054105 Suche in Google Scholarīenmore, C.J., Soignard, E., Guthrie, M., Amin, S.A., Weber, J.K.R., McKiernan, K., Wilding, M.C., and Yarger, J.L. (2010) Structural and topological changes in silica glass at pressure. Proceedings of the National Academy of Sciences, 112, 12310–12314. (2015) Core formation and core composition from coupled geochemical and geophysical constraints. 10.1039/b110768b Suche in Google Scholarīadro, J., Brodholt, J.P., Piet, H., Siebert, J., and Ryerson, F. Physical Chemistry Chemical Physics, 4, 1957–1963. (2002) Experimental and computer simulation study of the vibrational spectra of vermiculite. (2006) Pressure calibration of diamond anvil Raman gauge to 310 GPa. Journal of Geophysical Research, 93, 3437. (1988) Static compression and olivine flotation in ultrabasic silicate liquid. References citedĪgee, C.B., and Walker, D. Spears (CARS) for their excellent technical support. S.A.) for their insightful discussions T. Benson (High Pressure Collaborative Access Team, sector 16, APS, ANL, U. (Arizona State University, U.S.A.), and N. Yoo (Washington State University, U.S.A.), S-H. We also discuss the role of Mg-O component in MgSiO 3 and Mg 2SiO 4 glasses in controlling pressure-induced structural modifications and mechanical responses in these supercooled liquids. Based on these results, a structural evolution model for MgSiO 3 glass is proposed. Our combined data set provides consistent and complementary evidence of a series of pressure-induced structural modifications in MgSiO 3 glass at ~2, ~8, ~20, and ~40 GPa. Here we report the evolution of structural modifications and elastic properties of MgSiO 3 glass to pressures up to ~70 GPa using a combination of experimental techniques, including micro-confocal Raman spectroscopy, angle-dispersive X‑ray scattering, and Brillouin spectroscopy in the diamond-anvil cell. The correlation between structural and macroscopic properties of silicate liquids (densification, viscosity, chemical differentiation, etc.), however, remains poorly understood. Pressure-induced structural modifications in silicate melts play a crucial role in controlling dynamic processes in the deep interiors of the Earth and other planets.
0 Comments
Leave a Reply. |