High temperature elastic anisotropy of the perovskite and post-perovskite polymorphs of Al2O3

Geophysical Research Letters

Volumn 32, Issue 13, 2005, Pages 1-4

  Stackhouse, Stephen ^a   Brodholt, John P ^a   Price, G David ^a  

^a UNIVERSITY COLLEGE LONDON   (United Kingdom)

Author keywords

[No Author keywords available]

Indexed keywords

ALUMINA; ANISOTROPY; ELASTICITY; MOLECULAR DYNAMICS; PHASE TRANSITIONS; SEISMIC WAVES; SHEAR WAVES;

HIGH TEMPERATURE ELASTIC ANISOTROPY; POST-PEROVSKITE PHASE TRANSITION; SEISMIC PROPERTIES;

PEROVSKITE;

ANISOTROPY; HIGH TEMPERATURE; PEROVSKITE; PHASE TRANSITION; POLYMORPHISM; S-WAVE; SEISMIC PROPERTY;

EID: 24944518332     PISSN: 00948276     EISSN: None     Source Type: Journal    
DOI: 10.1029/2005GL023163     Document Type: Article

References (32)

1. 3 perovskite at lower mantle conditions, Earth Planet. Sci. Lett., 220, 317-330.
2. Anderson, D. L. (1989), Theory of the Earth, 148 pp., Blackwell Sci., Malden, Mass.
3. Blöchl, P. R. (1994), Projector augmented-wave method, Phys. Rev. B., 50, 17,953-17,979.
4. Brodholt, J. P. (2000), Pressure-induced changes in the compression mechanism of aluminous perovskite in the Earth's mantle, Nature, 407, 620-622.
5. 3 at high pressures, Geophys. Res. Lett., 32, L06303, doi:10.1029/2004GL022204.
6. 3 post-perovskite phase in the Earth's lowermost mantle, Nature, 430, 442-445.
7. Irifune, T. (1994), Absence of an aluminous phase in the upper part of the Earth's lower mantle, Nature, 370, 131-133.
8. Kendall, J.-M., and P. G. Silver (1998), Investigating causes of D″ anisotropy, in The Core-Mantle Boundary Region, Geodyn. Ser., vol. 28, edited by M. Gurnis et al., pp. 97-118, AGU, Washington, D. C.
9. Kresse, G., and J. Furthmüller (1996a), Efficient interative schemes for ab initio total-energy calculations using a plane-wave basis set, Phys. Rev. B, 54, 11,169-11,186.
10. Kresse, G., and J. Furthmüller (1996b), Efficiency of ab initio total energy calculations for metals and semiconductors using a plane-wave basis set, Comput. Mater. Sci., 6, 15-50.
11. Kresse, G., and D. Joubert (1999), From ultrasoft pseudopotentials to the projector augmented-wave method, Phys. Rev. B, 59, 1758-1775.
12. Mao, W. L., G. Shen, V. B. Prakapenka, Y. Meng, A. J. Campbell, D. L. Heinz, J. Shu, R. J. Hemley, and H.-K. Mao (2004), Ferromagnesian post-perovskite silicates in the D″ layer, Proc. Natl. Acad. Sci. U. S. A., 101, 15,867-15,869.
13. McNamara, A. K., S.-H. Karato, and P. E. van Keken (2001), Localization of dislocation creep in the lower mantle: Implications for the origin of seismic anisotropy, Earth Planet. Sci. Lett., 191, 85-99.
14. Monkhorst, H. J., and J. D. Pack (1976), Special points for Brillouin-zone integrations, Phys. Rev. B, 13, 5188-5192.
15. 3, Science, 304, 855-858.
16. Musgrave, M. J. P. (1970), Crystal Acoustics, Holden-Day, Boca Raton, Fla.
17. 3 perovskite at pressures and temperatures of the Earth's mantle, Nature, 411, 934-937.
18. 3 in Earth's D″ layer, Nature, 430, 445-448.
19. Panning, M., and B. Romanowicz (2004), Inferences on flow at the base of Earth's mantle based on seismic anisotropy, Science, 303, 351-353.
20. Perdew, J. P., J. A. Chevary, S. H. Vosko, K. A. Jackson, M. R. Pederson, D. J. Singh, and C. Fiolhais (1992), Atoms, molecules, solids, and surfaces - Applications of the generalized gradient approximation for exchange and correlation, Phys. Rev. B, 46, 6671-6687.
21. 3 perovskite to the core-mantle boundary, Geophys. Res. Lett., 31, L10603, doi:10.1029/ 2004GL019639.
22. Sidorin, I., M. Gurnis, D. V. Helmberger, and X. Ding (1998), Interpreting D″ seismic structure using synthetic waveforms computed from dynamic models, Earth Planet. Sci. Lett., 163, 31-41.
23. Sidorin, I., M. Gurnis, and D. V. Helmberger (1999), Evidence for a ubiquitous seismic discontinuity at the base of the mantle, Science, 286, 1326-1331.
24. 3, Earth Planet. Sci. Lett., 230, 1-10.
25. Su, W.-J., and A. M. Dziewonski (1997), Simultaneous inversion for 3-D variations in shear and bulk velocity in the mantle, Phys. Earth Planet. Inter., 100, 135-156.
26. Thomas, C., and J.-M. Kendall (2002), The lowermost mantle beneath northern Asia - II. Evidence for lower-mantle anisotropy, Geophys. J. Int., 151, 296-308.
27. 3 perovskite in the earth's lower mantle, Earth Planet. Sci. Lett., 224, 241-248.
28. 3, Geophys. Res. Lett., 31, L14603, doi:10.1029/2004GL020278.
29. Wang, Y., and J. P. Perdew (1991), Correlation hole of the spin-polarized electron-gas, with exact small-wave-vector and high density scaling, Phys. Rev. B, 44, 13,298-13,307.
30. 3 perovskite and geophysical implications, Earth Planet. Sci. Lett., 164, 371-378.
31. Wood, B. J., and D. C. Rubie (1996), The effect of alumina on phase transformations at the 600-kilometer discontinuity from Fe-Mg partitioning experiments, Science, 273, 1522-1524.
32. 3 perovskite under high pressure conditions from first-principles calculations, Earth Planet. Sci. Lett., 206, 617-625.