Experimental evidence for a phase transition in magnesium oxide at exoplanet pressures

Nature Geoscience

Volumn 6, Issue 11, 2013, Pages 926-929

  Coppari, F ^a   Smith, R F ^a   Eggert, J H ^a   Wang, J ^b   Rygg, J R ^a   Lazicki, A ^a   Hawreliak, J A ^a   Collins, G W ^a   Duffy, T S ^b  

^a LAWRENCE LIVERMORE NATIONAL LABORATORY   (United States)

^b PRINCETON UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

CESIUM; CRYSTAL STRUCTURE; EQUATION OF STATE; EXPERIMENTAL STUDY; MAGNESIUM; MANTLE CHEMISTRY; PHASE TRANSITION; ROCK SALT; SOLAR SYSTEM; VISCOSITY; X-RAY DIFFRACTION;

EID: 84887033793     PISSN: 17520894     EISSN: 17520908     Source Type: Journal    
DOI: 10.1038/ngeo1948     Document Type: Article

References (30)

1. Duffy, T. S., Hemley, R. J., & Mao, H-k. Equation of state and shear strength at multimegabar pressures: Magnesium oxide to 227 GPa. Phys. Rev. Lett. 74, 1371-1374 (1995).
2. Oganov, A. R., Gillan, M. J., & Price, G. D. Ab initio lattice dynamics and structural stability of MgO. J. Chem. Phys. 118, 10174-10182 (2003).
3. Belonoshko, A. B., Arapan, S., Martonak, R., & Rosengren, A. MgO phase diagram from first principles in a wide pressure-temperature range. Phys. Rev. B 81, 054110 (2010).
4. Dorfman, S. M., Prakapenka, V. B., Meng, Y., & Duffy, T. S. Intercomparison of pressure standards (Au, Pt, Mo, MgO, NaCl and Ne) to 2.5 Mbar. J. Geophys. Res. 117, B08210 (2012).
5. McWilliams, R. S. et al. Phase transformations and metallization of magnesium oxide at high pressure and temperature. Science 338, 1330-1333 (2012).
6. Karato, S-i. Rheological structure of the mantle of a super-Earth: Some insights from mineral physics. Icarus 212, 14-23 (2011).
7. Valencia, D., O'Connell, R. J., & Sasselov, D. Internal structure of massive terrestrial planets. Icarus 181, 545-554 (2006). (Pubitemid 43574114)
8. Wagner, F. W., Tosi, N., Sohl, F., Rauer, H., & Spohn, T. Rocky super-Earth interiors. Structure and internal dynamics of CoRoT-7b and Kepler-10b. Astron. Astrophys. 541, A103 (2012).
9. Swift, D. C. et al. Mass-radius relationships for exoplanets. Astrophys. J. 744, 59 (2012).
10. Umemoto, K., & Wentzcovitch, R. M. Two-stage dissociation in MgSiO3 post-perovskite. Earth Planet. Sci. Lett. 311, 225-229 (2011).
11. Tsuchiya, T., & Tsuchiya, J. Prediction of a hexagonal SiO2 phase affecting stabilities of MgSiO3 and CaSiO3 at multimegabar pressures. Proc. Natl Acad. Sci. USA 108, 1252-1255 (2011).
12. Dewaele, A., Fiquet, G., Andrault, D., & Hausermann, D. P-V-T equation of state of periclase from synchrotron measurements. J. Geophys. Res. 105, 2869-2877 (2000).
13. Strachan, A., Çagin, T., & Goddard, W. A. Phase diagram of MgO from density-functional theory and molecular-dynamics simulations. Phys. Rev. B 60, 15084-15093 (1999).
14. Mehl, M. J., Cohen, R. E., & Krakauer, H. Linearized augmented plane wave electronic structure calculation for MgO and CaO. J. Geophys. Res. 93, 8009-8022 (1988).
15. Drummond, N., & Ackland, G. Ab initio quasiharmonic equations of state for dynamically stabilized soft-mode materials. Phys. Rev. B 65, 184104-184104 (2002).
16. Boehly, T. R. et al. Initial performance results of the OMEGA laser system. Opt. Commun. 133, 495-506 (1997). (Pubitemid 127415632)
17. Rygg, J. R. et al. Powder diffraction from solids in the terapascal regime. Rev. Sci. Instrum. 83, 113904 (2012).
18. Celliers, P. M. et al. Line-imaging velocimeter for shock diagnostics at the OMEGA laser facility. Rev. Sci. Instrum. 75, 4916-4929 (2004). (Pubitemid 40001819)
19. Bradley, D. K. et al. Diamond at 800 GPa. Phys. Rev. Lett. 102, 075503 (2009).
20. Maw, J. R. A characteristics code for analysis of isentropic compression experiments. AIP Conf. Proc. 706, 1217-1220 (2004).
21. Rothman, S. D., & Maw, J. Characteristics analysis of isentropic compression experiments (ICE). J. Physique 134, 745-750 (2006). (Pubitemid 44681723)
22. Causà, M., Dovesi, R., Pisani, C., & Roetti, C. Electronic structure and stability of different crystal phases of magnesium oxide. Phys. Rev. B 33, 1308-1316 (1986).
23. Zhang, L., Gong, Z., & Fei, Y. Shock-induced phase transitions in the MgO-FeO system to 200GPa. J. Phys. Chem. Solids 69, 2344-2348 (2008).
24. Bukowinski, M. S. T. First principles equations of state of MgO and CaO. Geophys. Res. Lett. 12, 536-539 (1985). (Pubitemid 15586774)
25. Marsh, S. LASL Shock Hugoniot Data (Univ. California Press, 1980).
26. Vassiliou, M. S., & Ahrens, T. J. Hugoniot equation of state of periclase to 200 GPa. Geophys. Res. Lett. 8, 729-732 (1981).
27. Duffy, T. S., & Ahrens, T. J. Compressional sound velocity, equation of state, and constitutive response of shock-compressed magnesium oxide. J. Geophys. Res. 100, 529-542 (1995).
28. Wu, Z. et al. Pressure-volume-temperature relations in MgO: An ultrahigh pressure-temperature scale for planetary sciences applications. J. Geophys. Res. 113, 1-12 (2008).
29. Bond, J. C., O'Brien, D. P., & Lauretta, D. S. The compositional diversity of extrasolar terrestrial planets. I. In situ simulations. Astrophys. J. 715, 1050-1070 (2010).
30. van den Berg, A. P., Yuen, D. A., Beebe, G. L., & Christiansen, M. D. The dynamical impact of electronic thermal conductivity on deep mantle convection of exosolar planets. Phys. Earth Planet. Inter. 178, 136-154 (2010).