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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Nature Portfolio
2019
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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) |
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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 |
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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 |
work_keys_str_mv |
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