Electronic Transitions in Perovskite: Possible Nonconvecting Layers in the Lower Mantle
作者： James Badro , Jean-Pascal Rueff , Gyorgy Vanko , Giulio Monaco , Guillaume Fiquet
关键词:
摘要: We measured the spin state of iron in magnesium silicate perovskite (Mg0.9,Fe0.1)SiO3 at high pressure and found two electronic transitions occurring 70 gigapascals 120 gigapascals, corresponding to partial full electron pairing iron, respectively. The proportion low thus grows with depth, increasing transparency mantle infrared region, a maximum pressures consistent D″ layer above core-mantle boundary. resulting increase radiative thermal conductivity suggests existence nonconvecting layers lowermost mantle.
sciencemag.org
harvard.edu
unirioja.es
archives-ouvertes.fr参考文章(28)
Catherine McCammon, Perovskite as a possible sink for ferric iron in the lower mantle Nature. ,vol. 387, pp. 694- 696 ,(1997) , 10.1038/42685
Denis Andrault, Nathalie Bolfan-Casanova, Nicolas Guignot, Equation of state of lower mantle (Al,Fe)-MgSiO3 perovskite Earth and Planetary Science Letters. ,vol. 193, pp. 501- 508 ,(2001) , 10.1016/S0012-821X(01)00506-4
J. P. Rueff, M. Krisch, Y. Q. Cai, A. Kaprolat, M. Hanfland, M. Lorenzen, C. Masciovecchio, R. Verbeni, F. Sette, Magnetic and structural α − ε phase transition in Fe monitored by x-ray emission spectroscopy Physical Review B. ,vol. 60, pp. 14510- 14512 ,(1999) , 10.1103/PHYSREVB.60.14510
P. J. Tackley, Mantle Convection and Plate Tectonics: Toward an Integrated Physical and Chemical Theory Science. ,vol. 288, pp. 2002- 2007 ,(2000) , 10.1126/SCIENCE.288.5473.2002
Motohiko Murakami, Kei Hirose, Katsuyuki Kawamura, Nagayoshi Sata, Yasuo Ohishi, Post-Perovskite Phase Transition in MgSiO3 Science. ,vol. 304, pp. 855- 858 ,(2004) , 10.1126/SCIENCE.1095932
James Badro, Guillaume Fiquet, François Guyot, Jean-Pascal Rueff, Viktor V Struzhkin, Gyorgy Vanko, Giulio Monaco, None, Iron partitioning in Earth's Mantle: Toward a deep lower mantle discontinuity Science. ,vol. 300, pp. 789- 791 ,(2003) , 10.1126/SCIENCE.1081311
Isabelle Daniel, Hervé Cardon, Guillaume Fiquet, François Guyot, Mohamed Mezouar, Equation of state of Al‐bearing perovskite to lower mantle pressure conditions Geophysical Research Letters. ,vol. 28, pp. 3789- 3792 ,(2001) , 10.1029/2001GL013011
G. Peng, X. Wang, C. R. Randall, J. A. Moore, S. P. Cramer, Spin selective x‐ray absorption spectroscopy: Demonstration using high resolution Fe Kβ fluorescence Applied Physics Letters. ,vol. 65, pp. 2527- 2529 ,(1994) , 10.1063/1.112625
R. Boehler, High pressure experiments and the phase diagram of lower mantle and core materials Reviews of Geophysics. ,vol. 38, pp. 221- 245 ,(2000) , 10.1029/1998RG000053
J.-P. Rueff, C.-C. Kao, V. V. Struzhkin, J. Badro, J. Shu, R. J. Hemley, H. K. Mao, Pressure-Induced High-Spin to Low-Spin Transition in FeS Evidenced by X-Ray Emission Spectroscopy Physical Review Letters. ,vol. 82, pp. 3284- 3287 ,(1999) , 10.1103/PHYSREVLETT.82.3284