Compression of iron hydride to 80 GPa and hydrogen in the Earth's inner core
Compression of iron hydride to 80 GPa and hydrogen in the Earth's inner core
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DOI：
10.1029/2003gl019380
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发表时间：
2004-03
影响因子：
5.2
通讯作者：
N. Hirao;T. Kondo;E. Ohtani;K. Takemura;T. Kikegawa
中科院分区：
文献类型：
--
作者：
N. Hirao;T. Kondo;E. Ohtani;K. Takemura;T. Kikegawa
本文报道了用原位X射线衍射法测量氢化铁高达80gpa的状态方程的新数据。我们观察到在30至50 GPa时的异常压缩行为，并发现在50 GPa以上，氢化铁的可压缩性可能比在较低的压力下要低。在50 GPa以上的体积模量大于纯hcp -铁。我们的数据支持从头算的计算，表明氢氧化铁在60gpa左右发生磁跃迁。地球内核的密度不足可以用比以前认为的更少的氢的溶解来解释。
Here we report a new data on the equation of state of iron hydride up to 80 GPa measured by an in situ X‐ray diffraction method. We observed anomalous compression behavior at 30 to 50 GPa, and found that iron hydride might be less compressible above 50 GPa than at lower pressures. The bulk modulus above 50 GPa is larger than that of pure hcp‐iron. Our data support the ab initio calculation suggesting a magnetic transition of iron hydride at around 60 GPa. The density deficit of the Earth's inner core could be explained by dissolution of smaller amount of hydrogen than previously suggested.