Chin. Phys. Lett.  2006, Vol. 23 Issue (11): 3049-3051    DOI:
Original Articles |
Shock Compression and Phase Transitions of Magnesiowüstite (Mg,Fe)O up to Earth’s Lowermost Mantle Conditions
ZHANG Li1;GONG Zi-Zheng2,1
1Institute of High Pressure and High Temperature Physics, Southwest Jiaotong University, Chengdu 610031 2Beijing Institute of Spacecraft Environment Engineering, Beijing 100094
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ZHANG Li, GONG Zi-Zheng 2006 Chin. Phys. Lett. 23 3049-3051
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Abstract We report new shock-compression data for polycrystalline (Mg,Fe)O up to 130GPa shock pressures corresponding to Earth’s lowermost mantle conditions. Our data together with the existing shock-wave data of (Mg,Fe)O and its end-members MgO and FeO reveal that the Hugoniot curves of (Mg,Fe)O does not change with varying FeO content for their B1 phase (NaCl-structure) in the pressure--relative-volume plane. The evidence of the volume change within 3% at around 120GPa along the Hugoniot of (Mg0.6, Fe0.4)O is consistent with a structural transition from B1 phase (NaCl cubic) to B8 phase (NiAs-type hexagonal). Such a structural transition of (Mg,Fe)O, if indeed occurs, may in part contribute to the scattering of seismic waves and change in velocity gradient found in the lowermost mantle.
Keywords: 62.50.+p      64.30.+t      91.35.Lj     
Published: 01 November 2006
PACS:  62.50.+p  
  64.30.+t  
  91.35.Lj (Composition and state of the Earth's interior)  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2006/V23/I11/03049
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