Hexagonal Close-packed Iron Hydride behind the Conventional Phase Diagram

Abstract Hexagonal close-packed iron hydride, hcp FeH x , is absent from the conventional phase diagram of the Fe–H system, although hcp metallic Fe exists stably over extensive temperature (T) and pressure (P) conditions, including those corresponding to the Earth’s inner core. In situ X-ray and ne...

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Autores principales: Akihiko Machida, Hiroyuki Saitoh, Takanori Hattori, Asami Sano-Furukawa, Ken-ichi Funakoshi, Toyoto Sato, Shin-ichi Orimo, Katsutoshi Aoki
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Lenguaje:EN
Publicado: Nature Portfolio 2019
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Acceso en línea:https://doaj.org/article/461cfa469d674d3f8fb5482e9774581d
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spelling oai:doaj.org-article:461cfa469d674d3f8fb5482e9774581d2021-12-02T15:10:02ZHexagonal Close-packed Iron Hydride behind the Conventional Phase Diagram10.1038/s41598-019-48817-72045-2322https://doaj.org/article/461cfa469d674d3f8fb5482e9774581d2019-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-019-48817-7https://doaj.org/toc/2045-2322Abstract Hexagonal close-packed iron hydride, hcp FeH x , is absent from the conventional phase diagram of the Fe–H system, although hcp metallic Fe exists stably over extensive temperature (T) and pressure (P) conditions, including those corresponding to the Earth’s inner core. In situ X-ray and neutron diffraction measurements at temperatures ranging from 298 to 1073 K and H pressures ranging from 4 to 7 GPa revealed that the hcp hydride was formed for FeH x compositions when x < 0.6. Hydrogen atoms occupied the octahedral interstitial sites of the host metal lattice both partially and randomly. The hcp hydride exhibited a H-induced volume expansion of 2.48(5) Å3/H-atom, which was larger than that of the face-centered cubic (fcc) hydride. The hcp hydride showed an increase in x with T, whereas the fcc hydride showed a corresponding decrease. The present study provides guidance for further investigations of the Fe–H system over an extensive x–T–P region.Akihiko MachidaHiroyuki SaitohTakanori HattoriAsami Sano-FurukawaKen-ichi FunakoshiToyoto SatoShin-ichi OrimoKatsutoshi AokiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 9, Iss 1, Pp 1-9 (2019)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
Akihiko Machida
Hiroyuki Saitoh
Takanori Hattori
Asami Sano-Furukawa
Ken-ichi Funakoshi
Toyoto Sato
Shin-ichi Orimo
Katsutoshi Aoki
Hexagonal Close-packed Iron Hydride behind the Conventional Phase Diagram
description Abstract Hexagonal close-packed iron hydride, hcp FeH x , is absent from the conventional phase diagram of the Fe–H system, although hcp metallic Fe exists stably over extensive temperature (T) and pressure (P) conditions, including those corresponding to the Earth’s inner core. In situ X-ray and neutron diffraction measurements at temperatures ranging from 298 to 1073 K and H pressures ranging from 4 to 7 GPa revealed that the hcp hydride was formed for FeH x compositions when x < 0.6. Hydrogen atoms occupied the octahedral interstitial sites of the host metal lattice both partially and randomly. The hcp hydride exhibited a H-induced volume expansion of 2.48(5) Å3/H-atom, which was larger than that of the face-centered cubic (fcc) hydride. The hcp hydride showed an increase in x with T, whereas the fcc hydride showed a corresponding decrease. The present study provides guidance for further investigations of the Fe–H system over an extensive x–T–P region.
format article
author Akihiko Machida
Hiroyuki Saitoh
Takanori Hattori
Asami Sano-Furukawa
Ken-ichi Funakoshi
Toyoto Sato
Shin-ichi Orimo
Katsutoshi Aoki
author_facet Akihiko Machida
Hiroyuki Saitoh
Takanori Hattori
Asami Sano-Furukawa
Ken-ichi Funakoshi
Toyoto Sato
Shin-ichi Orimo
Katsutoshi Aoki
author_sort Akihiko Machida
title Hexagonal Close-packed Iron Hydride behind the Conventional Phase Diagram
title_short Hexagonal Close-packed Iron Hydride behind the Conventional Phase Diagram
title_full Hexagonal Close-packed Iron Hydride behind the Conventional Phase Diagram
title_fullStr Hexagonal Close-packed Iron Hydride behind the Conventional Phase Diagram
title_full_unstemmed Hexagonal Close-packed Iron Hydride behind the Conventional Phase Diagram
title_sort hexagonal close-packed iron hydride behind the conventional phase diagram
publisher Nature Portfolio
publishDate 2019
url https://doaj.org/article/461cfa469d674d3f8fb5482e9774581d
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