Compression of Fe-Si-H alloys to core pressures
Compression of Fe-Si-H alloys to core pressures
复制标题
将 Fe-Si-H 合金压缩至核心压力
DOI：
10.1002/2016gl068848
复制
发表时间：
2016
影响因子：
5.2
通讯作者：
Yasuo Ohishi
中科院分区：
文献类型：
--
作者：
Shoh Tagawa;Kenji Ohta;Kei Hirose;Chie Kato;Yasuo Ohishi
我们研究了六方密排（hcp）（Fe0.88Si0.12）1H0.61和（Fe0.88Si0.12）1H0.79（原子比）合金在金刚石压砧（DAC）中高达138 GPa的压缩行为。虽然先前报道的双hcp（dhcp）FeHx（x = 1）压缩曲线的实验结果相矛盾，但我们的数据表明hcp Fe0.88Si0.12Hx合金的压缩性与hcp Fe和Fe0.88Si0.12的压缩性非常相似，表明氢掺入铁不会显著改变其压缩行为。实验结果表明，当温度为5000K时，内核中氢的含量可达0.47wt%（FeH0.26）。计算的密度分布的Fe 0.88 Si 0.12 H 0.17合金含有0.32重量%的氢，除了地球化学要求的6.5重量%的硅匹配的地震观测的外核，支持氢是一个重要的核心轻元素。
We examined the compression behavior of hexagonal‐close‐packed (hcp) (Fe0.88Si0.12)1H0.61and (Fe0.88Si0.12)1H0.79(in atomic ratio) alloys up to 138 GPa in a diamond anvil cell (DAC). While contradicting experimental results were previously reported on the compression curve of double‐hcp (dhcp) FeHx(x≈ 1), our data show that the compressibility of hcp Fe0.88Si0.12Hxalloys is very similar to those of hcp Fe and Fe0.88Si0.12, indicating that the incorporation of hydrogen into iron does not change its compression behavior remarkably. The present experiments suggest that the inner core may contain up to 0.47 wt % hydrogen (FeH0.26) if temperature is 5000 K. The calculated density profile of Fe0.88Si0.12H0.17alloy containing 0.32 wt % hydrogen in addition to geochemically required 6.5 wt % silicon matches the seismological observations of the outer core, supporting that hydrogen is an important core light element.