XAS studies of pressure-induced structural and electronic transformations in α-FeOOH. (29th May 2019)

• Record Type: Journal Article
• Authors: Trcera, N; Layek, S; Shulman, M; Polian, A; Irifune, T; Itié, J-P; Rozenberg, G Kh
• Is Part Of: Journal of physics. Volume 31:Number 32(2019)
• Publication Date: 2019-05-29
• Subjects: XAS -- high pressure -- Fe K-edge -- goethite structure; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/ab1db1
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: Structural and electronic transformation taking place in α -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 Fe 3+ high to low spin transition at pressure above ~45 GPa. Our data are in excellent agreement with the results of recent single crystal XRD and Mössbauer spectroscopy studies (Xu et al 2013 Phys. Rev. Lett .111 175501), supporting the H-bonds symmetrization in iron oxyhydroxide, resulting from the Fe 3+ 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.