Hydrogen in earth and planetary materials observed by high-pressure diamond anvil cell NMR

2014 Fiscal Year Final Research Report

• Project/Area Number: 23340161
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Petrology/Mineralogy/Science of ore deposit
• Research Institution: Okayama University
• Principal Investigator: OKUCHI Takuo 岡山大学, 地球物質科学研究センター, 准教授 (40303599)
• Co-Investigator(Kenkyū-buntansha): YOSHINO Takashi 岡山大学, 地球物質科学研究センター, 准教授 (30423338) ; SASAKI Shigeo 岐阜大学, 工学部, 教授 (30196159)
• Co-Investigator(Renkei-kenkyūsha): YAMASHITA Shigeru 岡山大学, 地球物質科学研究センター, 准教授 (30260665)
• Project Period (FY): 2011-04-01 – 2015-03-31
• Keywords: ＮＭＲ / 水素 / 高圧力

Outline of Final Research Achievements

Chemcial bonding state and microscopic dynamics of hydrogen in minerals, ices and gas hydrates at high pressure are important problems in earth and planetary material sciences. Diamond anvil cell nuclear magnetic resonance spectroscopy is an unique probe to determine microscopic structure and dynamics of hydrogenous materials confined at high pressures. Here we successfully applied this technique to observe hydrogen's dynamics in hydrogen hydrate and in fluid hydogen in situ at high pressures to 5 GPa. In addition to this achievement, we have also determined hydrogen diffusion coefficients in brucite at high pressure and temperature conditions. We also newly developed a technique to observe neutron diffraction of methane hydrate at a few gigapascals of pressures.

Free Research Field

地球惑星内部物理学