Next Article in Journal
Anomalous Behaviors of Spin Waves Studied by Inelastic Light Scattering
Previous Article in Journal
Mg-Fe Layered Double Hydroxides Enhance Surfactin Production in Bacterial Cells
Open AccessArticle

Experimental Evidence for Partially Dehydrogenated ε-FeOOH

1
Center for High Pressure Science and Technology Advanced Research, Beijing 100094, China
2
Hawai’i Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawai’i at Manoa, Honolulu, HI 96822, USA
3
Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, USA
*
Author to whom correspondence should be addressed.
Crystals 2019, 9(7), 356; https://doi.org/10.3390/cryst9070356
Received: 18 June 2019 / Revised: 5 July 2019 / Accepted: 12 July 2019 / Published: 13 July 2019
(This article belongs to the Special Issue High Pressure Synthesis in Crystalline Materials)
  |  
PDF [2104 KB, uploaded 24 July 2019]
  |     |  

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. View Full-Text
Keywords: ε-FeOOH; high pressure; synchrotron X-ray diffraction; dehydrogenation ε-FeOOH; high pressure; synchrotron X-ray diffraction; dehydrogenation
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

Supplementary material

SciFeed

Share & Cite This Article

MDPI and ACS Style

Zhuang, Y.; Cui, Z.; Zhang, D.; Liu, J.; Tao, R.; Hu, Q. Experimental Evidence for Partially Dehydrogenated ε-FeOOH. Crystals 2019, 9, 356.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Crystals EISSN 2073-4352 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top