UCL Discovery Stage
UCL home » Library Services » Electronic resources » UCL Discovery Stage

Experimental Evidence for Partially Dehydrogenated epsilon-FeOOH

Zhuang, Yukai; Cui, Zhongxun; Zhang, Dongzhou; Liu, Jin; Tao, Renbiao; Hu, Qingyang; (2019) Experimental Evidence for Partially Dehydrogenated epsilon-FeOOH. Crystals , 9 (7) , Article 356. 10.3390/cryst9070356. Green open access

[thumbnail of crystals-09-00356-v2.pdf]
Preview
Text
crystals-09-00356-v2.pdf - Published Version

Download (2MB) | Preview

Abstract

Hydrogen in hydrous minerals becomes highly mobile as it approaches the geotherm of the lower mantle. Its diffusion and transportation behaviors under high pressure are important in order to understand the crystallographic properties of hydrous minerals. However, they are difficult to characterize due to the limit of weak X-ray signals from hydrogen. In this study, we measured the volume changes of hydrous ε-FeOOH under quasi-hydrostatic and non-hydrostatic conditions. Its equation of states was set as the cap line to compare with ε-FeOOH reheated and decompression from the higher pressure pyrite-FeO2Hx phase with 0 < x < 1. We found the volumes of those re-crystallized ε-FeOOH were generally 2.2% to 2.7% lower than fully hydrogenated ε-FeOOH. Our observations indicated that ε-FeOOH transformed from pyrite-FeO2Hx may inherit the hydrogen loss that occurred at the pyrite-phase. Hydrous minerals with partial dehydrogenation like ε-FeOOHx may bring it to a shallower depth (e.g., < 1700 km) of the lower mantle.

Type: Article
Title: Experimental Evidence for Partially Dehydrogenated epsilon-FeOOH
Open access status: An open access version is available from UCL Discovery
DOI: 10.3390/cryst9070356
Publisher version: https://doi.org/10.3390/cryst9070356
Language: English
Additional information: © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Keywords: Science & Technology, Physical Sciences, Technology, Crystallography, Materials Science, Multidisciplinary, Materials Science, epsilon-FeOOH, high pressure, synchrotron X-ray diffraction, dehydrogenation, EQUATION-OF-STATE, X-RAY-DIFFRACTION, HIGH-PRESSURE, HYDROUS PHASE, STABILITY, WATER, MANTLE, SYMMETRIZATION, OXYGEN, IRON
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery-pp.ucl.ac.uk/id/eprint/10163309
Downloads since deposit
153Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item