hydrogen diffusion dynamics of deep-Earth hydrous minerals by quasielastic neutron scattering

• Project/Area Number: 15K13593
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Petrology/Mineralogy/Economic geology
• Research Institution: Okayama University
• Principal Investigator: Okuchi Takuo 岡山大学, 惑星物質研究所, 准教授 (40303599)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2017: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000); Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 中性子準弾性散乱 / 水素拡散ダイナミクス / 含水鉱物 / 中性子散乱 / 水素拡散

Outline of Final Research Achievements

In the evolution of the earth, hydrogen plays many important roles. Hydrogen can be transported within minerals in a fast manner. A small amount of hydrogen dissolves into crystal structures of minerals which greatly changes many physical properties of them; these behaviors are distinctly different from the other elements. These phenomena are understood and predicted by finding atomic-scale diffusion dynamics process of hydrogen in the mineral media. Here we have applied quasielastic neutron scattering for first successfully analyzing the atomic-scale dynamics of hydrogen with the crystal structures of hydrous minerals.

Research Products

• [Int'l Joint Research] オークリッジ国立研究所(米国)
• [Journal Article] Quantitative analysis of hydrogen sites and occupancy in deep mantle hydrous wadsleyite using single crystal neutron diffraction (2016)
  • Author(s): Narangoo Purevjav, Takuo Okuchi, Naotaka Tomioka, Xiaoping Wang and Christina Hoffmann
  • Journal Title: Scientific Reports Volume: 6 Issue: 1 Pages: 34988-34988
  • DOI: 10.1038/srep34988
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Forge-hardened TiZr null-matrix alloy for neutron scattering under extreme conditions (2015)
  • Author(s): T. Okuchi, A. Hoshikawa, and T. Ishigaki
  • Journal Title: Metals Volume: 43 Issue: 4 Pages: 2340-2350
  • DOI: 10.1007/s00269-015-0791-4
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] 中性子準弾性散乱による含水鉱物内部の多様な水素輸送現象 (2017)
  • Author(s): 奥地拓生・プレジャブナランゴー・富岡尚敬・柴田薫
  • Organizer: 2016年度量子ビームサイエンスフェスタ
  • Place of Presentation: つくば国際会議場
  • Year and Date: 2017-03-14
  • Invited
• [Presentation] 中性子散乱による含水鉱物の水素配置と水素拡散の統合解析 (2017)
  • Author(s): 奥地拓生・プレジャブナランゴー・富岡尚敬・柴田薫
  • Organizer: 日本鉱物科学会年会
• [Presentation] 中性子準弾性散乱によるブルーサイトの水素局在拡散の観測と脱水分解反応におけるその役割の評価 (2016)
  • Author(s): 奥地拓生・プレジャブナランゴー・柴田薫
  • Organizer: 日本鉱物科学会2016年年会
  • Place of Presentation: 金沢大学
  • Year and Date: 2016-09-23
• [Presentation] 高密度含水Ｍｇ珪酸塩の水素格子フラストレーションと層間水素結合 (2015)
  • Author(s): 奥地拓生・プレジャブナランゴー・富岡尚敬
  • Organizer: 日本中性子科学会
  • Place of Presentation: 和光市民文化センター
  • Year and Date: 2015-12-10