Melting phase relation of FeH  up to 20 GPa: Implication for the temperature of the Earth's core

Sakamaki, Kazuo; Takáhashi, Eiichi; Nakajima, Yoichi; Nishihara, Yu; Funakoshi, K.; Suzuki, Toshihiro; Fukai, Yuh

doi:10.1016/j.pepi.2008.05.017

Cited by 118 publications

(126 citation statements)

References 30 publications

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“…The decomposition temperature of LiAlH4 has been estimated to 423-493 K at ambient pressure, 573 K at 4.7 GPa, 873 K at 12 GPa, and 973 K at 18.5 GPa based on the hydrogenation temperature of iron-alloys in previous studies. 9,7,17) According to these results, most of the temperature conditions in this study are well above the decomposition temperature, suggesting that hydrogen was supplied to Fe3C sample at the present conditions (only except for the conditions below 873 K at 14 GPa).…”

confidence: 52%

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Repulsive Nature for Hydrogen Incorporation to Fe3C up to 14 GPa

et al. 2014

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We have performed in situ X-ray diffraction measurements under high pressure and high temperature to study hydrogen solubility in Fe3C carbide. Hydrogen solubility can be estimated from a volume expansion associated with hydrogen incorporation into metal. The lattice volumes and phase relations of Fe3C-H system and Fe3C were measured up to 14 GPa and 1 973 K. The lattice volumes of Fe3C measured in this study are well fitted using the 3rd order Birch-Murnaghan equation of state with the reported elastic parameters of Fe3C. Obtained lattice volumes of Fe3C-H are quite consistent with those of Fe3C. No difference between the melting temperatures of Fe3C-H and Fe3C was observed. These results demonstrate that hydrogen incorporation into Fe3C does not occur and hydrogen is unlikely to coexist with carbon in iron-alloy up to 14 GPa.KEY WORDS: hydrogen solubility; iron carbide; high pressure.

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confidence: 52%

“…For instance, in case of iron, the depression of melting temperature from Fe to FeHx is reported to 600-900 K at 3-21 GPa. 17) Therefore, no difference in melting temperature between Fe3C-H and Fe3C is likely to reflect that hydrogen incorporation into Fe3C does not occur at these pressures.…”

Section: Phase Relations and Melting Temperatures Ofmentioning

confidence: 97%

Repulsive Nature for Hydrogen Incorporation to Fe3C up to 14 GPa

et al. 2014

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“…Therefore, the behaviour of hydrogen has been much more difficult to study than the other light elements. Various studies have inferred conclusions based on indirect evidence such as the texture change of the recovered sample8910, structural or volume changes of iron under high pressure41112131415161718 or the observation of bubbles in iron recovered by a very rapid pressure decrease19. Recently, studies from new approach such as first-principles calculations2021 or isotope measurement22 were reported but the results are still controversial.…”

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confidence: 99%

Hydrogenation of iron in the early stage of Earth’s evolution

et al. 2017

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Density of the Earth's core is lower than that of pure iron and the light element(s) in the core is a long-standing problem. Hydrogen is the most abundant element in the solar system and thus one of the important candidates. However, the dissolution process of hydrogen into iron remained unclear. Here we carry out high-pressure and high-temperature in situ neutron diffraction experiments and clarify that when the mixture of iron and hydrous minerals are heated, iron is hydrogenized soon after the hydrous mineral is dehydrated. This implies that early in the Earth's evolution, as the accumulated primordial material became hotter, the dissolution of hydrogen into iron occurred before any other materials melted. This suggests that hydrogen is likely the first light element dissolved into iron during the Earth's evolution and it may affect the behaviour of the other light elements in the later processes.

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“…Numerous research regarding the existence of iron hydrides has been discussed over the past few decades within the field of hydrogen storage materials and planetary science. [1][2][3][4][5] One of the progressive methods used to create bulk FeH is high pressure storage as FeH cannot be synthesized at ambient pressure. 6 This process requires 10 to 20 gpa of pressure in order to store hydrogen inside bulk Fe where it forms hexagonal close-packed phase.…”

Section: Chemisorption Of Hydrogen On Fe Clusters Through Hybrid Bondmentioning

confidence: 99%

Chemisorption of hydrogen on Fe clusters through hybrid bonding mechanisms

Takahashi

Isobe

Ohnuki

2013

Applied Physics Letters

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Monoxide carbon frequency shift as a tool for the characterization of TiO2 surfaces: Insights from first principles spectroscopy J. Chem. Phys. 138, 124702 (2013) Thermodynamics of iodide adsorption at the instantaneous air-water interface J. Chem. Phys. 138, 114709 (2013) Oxygen monomers and dimers at gas-phase and Ag(111)-supported nanographenes: A density functional theory study J. Appl. Phys. 113, 114307 (2013) On the equivalence between specific adsorption and kinetic equation descriptions of the admittance response in electrolytic cells

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Melting phase relation of FeH up to 20 GPa: Implication for the temperature of the Earth's core

Cited by 118 publications

References 30 publications

Repulsive Nature for Hydrogen Incorporation to Fe3C up to 14 GPa

Repulsive Nature for Hydrogen Incorporation to Fe3C up to 14 GPa

Hydrogenation of iron in the early stage of Earth’s evolution

Chemisorption of hydrogen on Fe clusters through hybrid bonding mechanisms

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