Special Issue "High Pressure Synthesis in Crystalline Materials"

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystalline Materials".

Deadline for manuscript submissions: closed (15 August 2019).

Special Issue Editors

Guest Editor
Prof. Przemyslaw Dera

University of Hawaii at Manoa School of Ocean and Earth Science and Technology, Hawai'i Institute of Geophysics and Planetology, Honolulu, United States
Website | E-Mail
Interests: High-pressure materials, non-quenchable phases, new chemical compounds
Guest Editor
Dr. Dongzhou Zhang

PX^2 Beamline Scientist 9700 S Cass Ave, Bldg 434A Argonne, IL 60439, USA
Website | E-Mail
Interests: optical spectroscopy, condensed matter physics, high pressure experiment, and planetary interiors

Special Issue Information

Dear colleagues,

Pressure is a principal thermodynamic parameter able to control the state, structure, physical properties and chemical behavior of matter. One of most unique properties of high pressure is the ability to change the pathways of chemical reactions and enable the synthesis of materials that cannot be obtained under ambient pressure conditions. New chemical compounds with unusual and unexpected stoichiometries, new types of bonding, and properties that may be of significant future technological applications have been synthesized in high-pressure experiments. This Special Issue will focus on reports of such results, from experiments, as well as based on computational predictions. Our understanding of the exact mechanisms of high-pressure solid state reactions and the factors controlling their progress and direction is still very preliminary, and improving this knowledge is key to harnessing the power of high pressure for practical applications.

Prof. Przemyslaw Dera
Dr. Dongzhou Zhang
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Crystals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • High-pressure materials
  • non-quenchable phases
  • new chemical compounds

Published Papers (1 paper)

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Research

Open AccessArticle
Experimental Evidence for Partially Dehydrogenated ε-FeOOH
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
PDF Full-text (2104 KB) | HTML Full-text | XML Full-text | Supplementary Files
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 [...] Read more.
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. Full article
(This article belongs to the Special Issue High Pressure Synthesis in Crystalline Materials)
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