X-ray diffraction and Mossbauer spectroscopy study of fcc iron hydride FeH at high pressures and implications for the composition of the Earth's core
X-ray diffraction and Mossbauer spectroscopy study of fcc iron hydride FeH at high pressures and implications for the composition of the Earth's core
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DOI：
10.1016/j.epsl.2011.05.015
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发表时间：
2011-07-15
影响因子：
5.3
通讯作者：
Dubrovinskaia, Natalia A.
中科院分区：
文献类型：
--
作者：
Narygina, Olga;Dubrovinsky, Leonid S.;Dubrovinskaia, Natalia A.
在压力超过30 GPa，温度超过1600(50)K的条件下合成了相fcc FeHx （x近似于1）。在室温下，这种氢化铁在19(1)GPa到至少68(2)GPa（本研究中达到的最高压力）的压力下是稳定的。对fcc FeHx在室温下的PV数据进行拟合，得到状态方程参数：V-0 =53.8(3)埃(3),K-0 = 99(5) GPa, K′=11.7(5)。根据这些数据，估计与地核密度相匹配的氢的数量为外核中0.5-1 wt.%的氢和内核中0.08-0.16 wt.%的氢。我们的研究结果还表明，氢和碳不会同时出现在地核中。(C) 2011 Elsevier B.V.版权所有
The phase fcc FeHx (x similar to 1) was synthesized at pressures over 30 GPa and temperatures over 1600(50)K. At room temperature this iron hydride is stable at pressures from 19(1) GPa up to at least 68(2) GPa (the highest pressure achieved in this study). A fit of the PV data collected for fcc FeHx at room temperature gives the following parameters for the equation of state: V-0 =53.8(3) angstrom(3), K-0 = 99(5) GPa, K' =11.7(5). Using this data the amount of H required to match the density of the Earth's core was estimated to be 0.5-1 wt.% hydrogen in the outer core and 0.08-0.16 wt.% hydrogen in the inner core. Our results also suggest that hydrogen and carbon do not occur together in the Earth's core. (C) 2011 Elsevier B.V. All rights reserved.