Diffusion in MgO at high pressures: Constraints on deformation mechanisms and chemical transport at the core-mantle boundary

Geophysical Research Letters

Volumn 30, Issue 2, 2003, Pages

  Van Orman, James A ^a,b   Fei, Yingwei ^a   Hauri, Erik H ^a   Wang, Jianhua ^a  

^a GEOPHYSICAL LABORATORY   (United States)

^b CASE WESTERN RESERVE UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

CREEP; DEFORMATION; GRAIN BOUNDARIES; RHEOLOGY; SHEAR STRESS; ALUMINUM; BINDING ENERGY; CALCULATIONS; MAGNESIA; STRUCTURAL GEOLOGY;

CATION VACANCIES; CHEMICAL EXCHANGE; CHEMICAL TRANSPORT; CORE-MANTLE BOUNDARY; DEFORMATION MECHANISM; DISLOCATION CREEP; FIRST-PRINCIPLES CALCULATION; GRAIN-BOUNDARY DIFFUSION; HIGH-PRESSURE EXPERIMENT;

MAGNESIA; DIFFUSION;

CORE-MANTLE BOUNDARY; DIFFUSION; EXPERIMENTAL MINERALOGY; HIGH PRESSURE; PERICLASE;

EID: 0038266281     PISSN: 00948276     EISSN: None     Source Type: Journal    
DOI: 10.1029/2002GL016343     Document Type: Article

References (28)

1. Ando, K., Y. Kurokawa, and Y. Oishi, Oxygen self-diffusion in Fe-doped MgO single crystals, J. Chem. Phys., 78, 6890 6892, 1983.
2. Bertka, C. M., and Y. Fei, Mineralogy of the Martian interior up to core-mantle boundary pressures, J. Geophys. Res., 102, 5251-5264, 1997.
3. Frost, H. J. and M. F. Ashby, Deformation-Mechanism Maps, 166 pp., Pergamon Press, Oxford, UK, 1982.
4. Goarant, F., F. Guyot, J. Peyronneau, and J. P. Poirier, High-pressure and high-temperature reactions between silicates and iron alloys in the diamond anvil cell, studied by analytical electron microscopy, J. Geophys. Res., 97, 4477-4487, 1992.
5. Ita, J., and R. E. Cohen, Effects of pressure on diffusion and vacancy formation in MgO from non-empirical free-energy integrations, Phys. Rev. Lett., 79, 3198-3201, 1997.
6. Hashin, Z., and S. Shtrikman, A variational approach to the theory of the effective magnetic permeability of multiphase materials. J. Appl. Phys., 33, 3125-3131, 1962.
7. Hirsch, L. M., and T. J. Shankland, Equilibrium point defect concentrations in MgO: Understanding the mechanisms of conduction and diffusion and the role of Fe impurities, J. Geophys. Res., 96, 385 403, 1991.
8. Karato, S., Rheology of the lower mantle, Phys. Earth Planet. Interiors, 24, 1-14, 1981.
9. Karato, S.-I., Some remarks on the origin of seismic anisotropy in the D" layer. Earth Planets Space, 50, 1019-1028, 1998.
10. Karato, S.-I., S. Zhang, and H.-R. Wenk, Superplasticity in Earth's lower mantle: Evidence from seismic anisotropy and rock physics. Science, 270, 458-461, 1995.
11. Knittle, E., and R. Jeanloz, Earth's core-mantle boundary: Results of experiments at high pressures and temperatures, Science, 251, 1438-1443, 1991.
12. LeClaire, A. D., The analysis of grain boundary diffusion measurements, Brit. J. Appl. Phys., 14, 351-356, 1963.
13. Lidiard, A. B., Impurity diffusion in polar crystals, Phil. Mag., 46, 815 823, 1955.
14. McNamara, A. K., P. E. van Keken, and S.-I. Karato, Development of anisotropic structure in the Earth's lower mantle by solid-state convection, Nature, 416, 310-314, 2002.
15. Narayan, J., and J. Washburn, Self-climb of dislocation loops in magnesium oxide, Phil. Mag., 26, 1179-1189, 1972.
16. Sammis, C. G., J. C. Smith, and G. Schubert, A critical assessment of estimation methods for activation volume, J. Geophys. Res., 86, 10,707-10,718, 1981.
17. Sempolinski, D. R., and W. D. Kingery, Ionic conductivity and magnesium vacancy mobility in magnesium oxide, J. Amer. Ceram. Soc., 63, 664 669, 1980.
18. Solomatov, V. S., R. El-Khozondar, and V. Tikare, Grain size in the lower mantle: Constraints from numerical modeling of grain growth in two-phase systems, Phys. Earth Planet. Interiors, 129, 265-282, 2002.
19. 2O), Earth Planet. Sci. Lett., 194, 229-240, 2001.
20. Takeuchi, S., and A. S. Argon, Steady-state creep of single-phase crystalline matter at high temperature, J. Mater. Sci., 11, 1542-1566, 1976.
21. van Westrenen, W., J. A. Van Orman, H. Watson, Y. Fei, and E. B. Watson, Assessment of temperature gradients in multi-anvil assembles using spinel layer growth kinetics, Geochem. Geophys. Geosys., in review.
22. 187Os enrichment in some mantle plume sources: Evidence for core-mantle interaction?, Science, 269, 819-822, 1995.
23. 3, J. Phys. Chem. Solids, 32, 305-312, 1971.
24. Wuensch, B. J., W. C. Steele, and T. Vasilos, Cation self-diffusion in single-crystal MgO, J. Chem. Phys., 58, 5258-5266, 1973.
25. Yamazaki, D., and S.-I. Karato, Some mineral physics constraints on the rheology and geothermal structure of Earth's lower mantle, Am. Mineral., 86, 385-391, 2001.
26. 3 perovskite at 25 GPa, Phys. Earth Planet. Interiors, 119, 299-309, 2000.
27. Yang, M. H., and C. P. Flynn, Intrinsic diffusion properties of an oxide: MgO, Phys. Rev. Lett., 73, 1809-1812, 1994.
28. Yoo, H. I., B. J. Wuensch, and W. T. Petuskey, Secondary ion mass spectrometric analysis of oxygen self-diffusion in single-crystal MgO, in Advances in Ceramics, vol. 10, 394-405, edited by W. D. Kingery, American Ceramic Society, Columbus, OH, USA, 1981.