【摘 要】
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We report new shock-compression data for polycrystalline (Mg, Fe)O up to 130 Gpa shock pressures corresponding to Earths lowermost mantle conditions. Our data t
【机 构】
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Institute of High Pressure and High Temperature Physics, Southwest Jiaotong University, Chengdu 6100
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We report new shock-compression data for polycrystalline (Mg, Fe)O up to 130 Gpa shock pressures corresponding to Earths 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 120 Gpa 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.
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