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Press released by Takezawa and Hirose – Large Amounts of Helium in the Earth’s Core?

Haruki Takezawa (M2 student) and Kei Hirose, in collaboration with Naoya Sakamoto (Hokkaido University) and Han Hsu (Academia Sinica), have released a joint press statement. They successfully synthesized iron-helium compounds and demonstrated their existence using theoretical calculations and mass spectrometry.

This research have been published in the journal Physical Review Letters. The paper was selected as an “Editors’ Suggestion” due to its significance and was also featured in the “Physics”. The research was chosen as the cover image for the issue.

For more details, please refer to the following press releases and articles:

Press Releases & Articles
University of Tokyo：https://www.s.u-tokyo.ac.jp/ja/press/10669/
Hokkaido University：https://www.hokudai.ac.jp/news/pdf/250228_pr3.pdf
Synopsis：https://physics.aps.org/articles/v18/s22

Publication details
Journal：Physical Review Letters
Title：Formation of iron-helium compounds under high pressure
Authors：Haruki Takezawa*, Han Hsu*, Kei Hirose*, Fumiya Sakai, Suyu Fu, Hitoshi Gomi, Shiro Miwa, and Naoya Sakamoto
DOI：10.1103/PhysRevLett.134.084101
https://doi.org/10.1103/PhysRevLett.134.084101

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第65回高圧討論会に研究室から6名参加します

2024年11月13日～2024年11月15日に岩手県で行われる
第65回高圧討論会に廣瀬研究室から6名が参加します。

以下が廣瀬研究室の学生による発表です。是非聞きに来てください！

2024/11/13 ポスター発表 14:00~15:30
1P42 メタンの高温高圧での相転移と液相密度
竹下 潤・彦坂 晃太郎・坂井 郁哉・廣瀬 敬

1P52 (Mg, Fe)O ferropericlaseの高温高圧下電気伝導度測定：下部マントルP-T条件における鉄のスピン転移の影響
平岡 大和・奥田 善之・廣瀬 敬・稲田 真子・彦坂 晃太郎

1P59 地球コアの組成・温度の解明に向けたFe-FeH系における融解実験
三田 修平・田川 翔・廣瀬 敬・幾田 凪

1P62 地球コア条件下におけるFe-C-H系の融解実験
堤 裕太郎・廣瀬 敬

1P63 Fe-Si-O系の融解実験と地球核でのケイ素・酸素の振る舞い
幾田 凪・廣瀬 敬

1P65 高温高圧下におけるH2O-NH3系の電気伝導度測定
稲田 真子・奥田 善之・彦坂 晃太郎・廣瀬 敬

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A joint seminar camp with Ohta Lab and Sinmyo Lab was held!

A joint seminar camp (2024.03.18-20) was held with Ohta Laboratory (Tokyo Institute of Technology) and Sinmyo Laboratory (Meiji University), both working on high-pressure Earth science research similar to the Hirose Lab.

The seminar presentations covered a wide range of topics, including high-pressure technology development and research on organic materials, which are not commonly discussed within the Hirose Lab. This provided us with the opportunity to explore various fields.

Furthermore, during breaks in the seminar, everyone enjoyed a softball and football game. Hirose-sensei, Ohta-sensei, and Sinmyo-sensei joined us at the game, which was a very good chance to deepening friendships.

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Prof. Hirose received Robert Wilhelm Bunsen Medal

Prof. Hirose received Robert Wilhelm Bunsen Medal from The European Geosciences Union (EGU).

This medal was established in recognition of the scientific acchievement of Robert Wilherm Bunsen. It is awareded to significant research in geochemistry, mineralogy, petrology, and volcanology.

EGU2024 awards and medals:
https://www.egu.eu/news/987/egu-announces-its-2024-awards-and-medals/

Robert Wilhelm Bunsen Medal:
https://www.egu.eu/awards-medals/robert-wilhelm-bunsen/

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We will attend AGU23!

AGU23 will be held in San Francisco, U.S.A., from December 11 to 15.
Eight members from Hirose lab will participate and make talks and posters.

The following is the presentation by Hirose Lab.

【Monday, 11 December】
DI13A-04: 14:42 – 14:52
Electrical Conductivity of Superionic Hydrated SiO2: Implications for High Conductivity Anomalies Beneath Subduction Zones
Mako Inada, Yoshiyuki Okuda, Kei Hirose, Kenta Oka, Hideharu Kuwahara and Steeve Gréaux

【Tuesday, 12 December 2023】
MR21C-0069: 08:30 – 12:50
Liquid Density of Fe-H Alloys in Earth’s Outer Core
Suyu Fu, Kei Hirose, Shunpei Yokoo and Fumiya Sakai

DI23B-0027: 14:10 – 18:30
The Solubility of Helium in Iron at High Pressures; Helium in the Earth’s Core?
Haruki Takezawa and Kei Hirose

【Wednesday, 13 December 2023】
DI31B-0011: 08:30 – 12:50
The Effect of Hydrogen on the Metal-Silicate Partitioning of Sulfur
Shunpei Yokoo, Naoya Sakamoto, Kei Hirose, Yutaro Tsutsumi and Hisayoshi Yurimoto

【Thursday, 14 December 2023】
MR42A-05: 11:06 – 11:16
S-rich Sulfide Fe12S7 may Crystallize in the Martian Core
Fumiya Sakai, Kei Hirose, Hitoshi Gomi and Nozomu Hiraoka

MR42A-08: 11:39 – 11:49
The Fe-FeH Phase Diagram to Core Pressures by Experiments and Thermodynamic Modeling and the Possible Range of Earth’s Core Composition
Kei Hirose, George R Helffrich, Suyu Fu, Shoh Tagawa, Nagi Ikuta, Naoya Sakamoto and Hisayoshi Yurimoto

MR43C-0111: 14:10 – 18:30
Eutectic Melting Curve for the Fe-FeH System
Shuhei Mita, Suyu Fu and Kei Hirose

【Friday, 15 December 2023】
DI51B-0005: 08:30 – 12:50
Al-Bearing Hydrated SiO2 in Subducted MORB Crust Does Not Dehydrate at the Core-Mantle Boundary
Yutaro Tsutsumi, Naoya Sakamoto, Kei Hirose and Hisayoshi Yurimoto