R4: Mineral sciences of the Earth surface

[R4-01] Surface diffusion analysis of hydroxide minerals experiencing dehydration by quasi-elastic neutron scattering

*Takuo Okuchi¹, Yuhei Umeda¹, Naotaka Tomioka², Yusuke Seto³, Takeshi Yamada⁴ (1. Kyoto Univ., 2. JAMSTEC, 3. Osaka Metro. Univ., 4. CROSS Tokai)

Keywords:hydrous minerals, hydrogen dynamics, dehydration, quasi-elastic neutron scattering

We previously demonstrated that quasi-elastic neutron scattering is uniquely effective for analyzing hydrogen dynamics in hydrous minerals. In this study, the method is applied for partially-dehydrated hydroxide minerals at high temperatures. Defect-related enhancement of surface diffusion of hydrogen is observed, especially in the partially-dehydrated Mg(OH)₂ which is made of nanometer-sized particles