Phase relations of iron-silicon alloys at high pressure and high temperature
Phase relations of iron-silicon alloys at high pressure and high temperature
复制标题
DOI：
10.1007/s00269-009-0296-0
复制
发表时间：
2009-10-01
影响因子：
1.4
通讯作者：
Ohishi, Yasuo
中科院分区：
文献类型：
--
作者：
Kuwayama, Yasuhiro;Sawai, Toshimitsu;Ohishi, Yasuo
在130 GPa和2,600 K下，用同步辐射X射线衍射法研究了Fe-6.4wt%Si和Fe-9.9wt%Si合金的相关系，沿着用场发射电子探针分析了淬火样品的化学成分。我们发现，硅在固体六氯化磷铁中的最大溶解度随压力的增加而增加。对于Fe-9.9wt%Si，hcp + B2和hcp相之间的相边界的线性外推表明固体hcp-铁在地球内核条件下可以包括超过9.9wt%的Si。如果硅是外芯中的主要轻元素，则在内芯固化期间，大量的硅可以被并入内芯中。
The phase relations of Fe-6.4 wt% Si and Fe-9.9 wt% Si have been investigated up to 130 GPa and 2,600 K based on in situ synchrotron X-ray diffraction measurements in a laser-heated diamond-anvil cell along with chemical analysis of the quenched samples using a field-emission electron probe microanalyzer. We found that the maximum solubility of silicon in solid hcp-iron increases with increasing pressure. Linear extrapolation of the phase boundary between hcp + B2 and hcp phases for Fe-9.9 wt% Si suggests that the solid hcp-iron can include more than 9.9 wt% Si at the Earth's inner-core conditions. If silicon is a major light element in the outer core, a substantial amount of silicon may be incorporated into the inner core during inner-core solidification.