12:00 PM - 12:15 PM
[SGC52-12] Investigation of H-D isotope effect in a hydrous mineral using neutron diffraction
Keywords:hydrogen bond, neutron diffraction, hydrous mineral
In this study, we investigated the evolution of hydrogen bond geometry in distorted rutile type mineral guyanite (CrOOH) under pressure using neutron diffraction. This mineral is known to have a large difference in the unit cell volume between CrOOH and CrOOD at ambient pressure. However the previous X-ray diffraction study (Sano-Furukawa et al., 2012) has indicated that this volume difference merges at around 5 GPa. We attempt to explain the cause of the phenomena from the crystallographic view.
Neutron diffraction experiment was conducted at the PLANET beamline in J-PARC by using Paris-Edinburgh press. We observed the change in deuterium distribution from order to disorder at around 3~5 GPa. In the presentation, the relation between the change of hydrogen bond geometry and reduced partition function ratio will be discussed.