Iron-water reaction at high pressure and temperature, and hydrogen transport into the core
Iron-water reaction at high pressure and temperature, and hydrogen transport into the core
复制标题
DOI：
10.1007/s00269-004-0443-6
复制
发表时间：
2005-04-01
影响因子：
1.4
通讯作者：
Kikegawa, T
中科院分区：
文献类型：
--
作者：
Ohtani, E;Hirao, N;Kikegawa, T
在金刚石对顶砧装置（DAC）中，在6 GPa ~ 84 GPa和1, 000 K以上的压力下，观察到金属铁与水直接反应生成铁氢化物和铁氧化物3Fe + H2O → 2FeH（x）+ FeO。氢化铁是dhcpFeH（x）或γ-FeHx，氧化铁在至少高达37 GPa的压力下具有菱面体或B1结构。在84 GPa下观察到dhcpFeH（x）和FeO形成的具有B8结构的组装体。在原始地球中，低温原始物质脱水形成的水与高温组分中的金属铁反应，形成铁氢化物FeHx和铁氧化物FeO。前者将被纳入铁形成核心。因此，氢可能是地球核心的重要元素。在地球的吸积阶段，这种反应对于氢向地核的输送是必不可少的。
We observed a direct reaction of metallic iron with water to form iron hydride and iron oxide, 3Fe + H2O- > 2FeH(x) + FeO, at pressures from 6 GPa to 84 GPa and temperatures above 1,000 K in diamond anvil cell (DAC). Iron hydride is dhcpFeH(x) or gamma-FeHx, and iron oxide has the rhombohedral or B1 structure at pressures at least up to 37 GPa. The formation of an assembly composed of dhcpFeH(x) and FeO with the B8 structure was observed at 84 GPa. In primordial Earth, water formed by dehydration of the low temperature primitive materials reacts with metallic iron in the high temperature component to form iron hydride FeHx and iron oxide FeO. The former would be incorporated in the iron forming the core. Thus hydrogen could be an important element of the Earth's core. This reaction would be essential for transport of hydrogen into the core in the accretion stage of the Earth.