Yuichiro Mori

Pressure-induced thermal expansion anomalies in dhcp iron hydride associated with magnetoelastic coupling

Yuichiro Mori, Katsutoshi Aoki, Hiroyuki Kagi, Masahiro Takano et autres

Iron hydride with a double hexagonal close-packed structure (dhcp-FeHx) undergoes a ferromagnetic-paramagnetic transition without changing its crystal structure. Despite its relevance to metal-hydrogen interactions and magnetically driven elasticity, the extensive investigation of this phase is almost limited to room temperature. Here, we …

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The olivine-ringwoodite transformation triggers deep slab seismicity and rheological weakening

Rikuto Honda, Tomoaki Kubo, Masaaki Miyahara, Takuya Iwasato et autres

Abstract The subducting cold oceanic plates (slabs) exhibit two paradoxical deformation behaviors: deep seismicity and rheological weakening within the mantle transition zone (MTZ, ~400–700 km depths). Although the transformation of metastable olivine wedge (MOW) 1,2 in cold slabs has been proposed as …

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Hydrogenation Reactions in Iron-Light Element Systems at High Temperature and High Pressure

Hiroyuki Kagi, Yuichiro Mori, Masahiro TAKANO

The Earth’s core contains nonnegligible concentrations of light elements, reducing the density of the iron core. The hydrogen-induced volume expansion of iron and related materials is key to clarify the chemical composition of the core. This article reviews recent advances on the …

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Live Football Commentary System Providing Background Information

Yuichiro Mori, Aru Maekawa, Satoshi Kosugi, Tatsuya Ishigaki et autres

Yuichiro Mori, Chikara Tanaka, Aru Maekawa, Satoshi Kosugi, Tatsuya Ishigaki, Kotaro Funakoshi, Hiroya Takamura, Manabu Okumura. Proceedings of the 63rd Annual Meeting of the Association for Computational Linguistics (Volume 3: System Demonstrations). 2025.

The olivine-ringwoodite transformation triggers deep slab seismicity and rheological weakening

Honda Rikuto, Tomoaki Kubo, Masaaki Miyahara, Takuya Iwasato et autres

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Hydrogenation of silicon-bearing hexagonal close-packed iron and its implications for density deficits in the inner core

Yuichiro Mori, Hiroyuki Kagi, Katsutoshi Aoki, Masahiro Takano et autres

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Low reactivity of stoichiometric FeS with hydrogen at high-pressure and high-temperature conditions

Masahiro Takano, Hiroyuki Kagi, Yuichiro Mori, Katsutoshi Aoki et autres

Hydrogenation of iron sulfide (FeS) under high-pressure and high-temperature conditions has attracted attention because hydrogen and sulfur are promising candidates as light elements in the cores of the Earth and other terrestrial planets. In earlier reports describing the hydrogenation of FeS, the …

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High-pressure and high-temperature neutron diffraction experiments of Si-bearing iron deuteride with hcp structure

Yuichiro Mori, Hiroyuki Kagi

The identification of light elements in the Earth's core has been an open question for more than 50 years. From seismic observation, the Earth’s core is believed to contain some light elements because it is about 10% less dense than pure Fe …

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Increase of hydrogen-induced volume expansion of hcp-Fe by Si dissolution – Constraint to hydrogen content in the core

Yuichiro Mori, Hiroyuki Kagi, Katsutoshi Aoki, Sho Kakizawa et autres

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Revised α/ε′–γ phase boundaries for the Fe–H system

Sho Kakizawa, Chikara Shito, Yuichiro Mori, Hiroyuki Saitoh et autres

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Behavior of light elements in iron-silicate-water-sulfur system during early Earth’s evolution

Riko Iizuka, Hirotada Gotou, Chikara Shito, Ko Fukuyama et autres

Abstract Hydrogen (H) is considered to be one of the candidates for light elements in the Earth’s core, but the amount and timing of delivery have been unknown. We investigated the effects of sulfur (S), another candidate element in the core, on …

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Neutron diffraction study of hydrogen site occupancy in Fe0.95Si0.05 at 14.7 GPa and 800 K

Yuichiro Mori, Hiroyuki Kagi, Sho Kakizawa, Kazuki Komatsu et autres

The Earth’s core is believed to contain some light elements because it is 10% less dense than pure Fe under the corresponding pressure and temperature conditions. Hydrogen, a promising candidate among light elements, has phase relations and physical properties that have been …

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