| Shock Compression and Phase Transitions of Magnesiowiistite （Mg,Fe）O up to Earth＇s Lowermost Mantle Conditions |
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| 引用本文： | 张莉,龚自正.Shock Compression and Phase Transitions of Magnesiowiistite （Mg,Fe）O up to Earth＇s Lowermost Mantle Conditions[J].中国物理快报,2006,23(11):3049-3051. |
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| 作者姓名： | 张莉 龚自正 |
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| 作者单位： | [1]Institute of High Pressure and High Temperature Physics, Southwest Jiaotong University, Chengdu 610031 [2]Beijing Institute of Spacecraft Environment Engineering, Beijing 100094 |
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| 基金项目： | Supported by the National Natural Science Foundation of China under Grant No 40474033, and the Specialized Research Fund for the Doctoral Program of Higher Education of China under Grant No 20050613017. |
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| 摘 要： | We report new shock-compression data for polycrystalline （Mg,Fe）O up to 130 GPa 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 （Mgo.6, Feo.4）O is consistent with a structural transition from B1 phase （NaC1 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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| 关 键 词： | 振动压缩 相转换 地球最低地幔条件 地震波 地球物理学 |
| 收稿时间： | 2006-06-20 |
| 修稿时间： | 2006-06-20 |
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