HIGH-PRESSURE CHEMISTRY OF HYDROGEN IN METALS - INSITU STUDY OF IRON HYDRIDE

被引：168

作者：

BADDING, JV ^{[1
]}

HEMLEY, RJ ^{[1
]}

MAO, HK ^{[1
]}

机构：

[1] CARNEGIE INST WASHINGTON, CTR HIGH PRESSURE RES, WASHINGTON, DC 20015 USA

来源：

SCIENCE | 1991年 / 253卷 / 5018期

关键词：

D O I：

10.1126/science.253.5018.421

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Optical observations and x-ray diffraction measurements of the reaction between iron and hydrogen at high pressure to form iron hydride are described. The reaction is associated with a sudden pressure-induced expansion at 3.5 gigapascals of iron samples immersed in fluid hydrogen. Synchrotron x-ray diffraction measurements carried out to 62 gigapascals demonstrate that iron hydride has a double hexagonal close-packed structure, a cell volume up to 17% larger than pure iron, and a stoichiometry close to FeH. These results greatly extend the pressure range over which the technologically important iron-hydrogen phase diagram has been characterized and have implications for problems ranging from hydrogen degradation and embrittlement of ferrous metals to the presence of hydrogen in Earth's metallic core.

引用

页码：421 / 424

页数：4