期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 31, 期 32, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-648X/ab1db1
关键词
XAS; high pressure; Fe K-edge; goethite structure
资金
- Israel Science Foundation [1189/14, 1552/18]
- Planning and Budget Commission from Higher Education Ministry of Israel
- SOLEIL [20151069]
Structural and electronic transformation taking place in alpha-FeOOH goethite have been studied by Fe K-edge x-ray absorption spectroscopy at pressures up to 50 GPa. These studies have shown the symmetrization of FeO6 octahedra coinciding with the Fe3+ high to low spin transition at pressure above similar to 45 GPa. Our data are in excellent agreement with the results of recent single crystal XRD and Mossbauer spectroscopy studies (Xu et al 2013 Phys. Rev. Lett. 111 175501), supporting the H-bonds symmetrization in iron oxyhydroxide, resulting from the Fe3+ high-to-low spin crossover at above 45 GPa. Our study shows an applicability of the x-ray absorption spectroscopy in a further study of the H-bonds symmetrization phenomenon.
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