Neutron imaging for calculating hydrogen diffusivity in polycrystalline forsterite aggregates

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dc.contributor.authorPatabendigedara, SKen_AU
dc.contributor.authorClark, SMen_AU
dc.contributor.authorSalvemini, Fen_AU
dc.date.accessioned2023-09-21T01:39:25Zen_AU
dc.date.available2023-09-21T01:39:25Zen_AU
dc.date.issued2018-12-13en_AU
dc.date.statistics2023-02-24en_AU
dc.descriptionThe citation shows F. Salvemini incorrectly as F. F. Salvemin.en_AU
dc.description.abstractAn understanding of hydrogen diffusion in nominally anhydrous minerals is essential for the correct interpretation of conductivity dissimilarity in the Earth mantle. The mechanism of hydrogen diffusion in dominant mantle minerals was described by Demouchy (2010) using a defect model in crystalline materials. The effects of in-grain and grain boundary diffusion are separated using the bricklayer model and other derivatives of it (Tuller 2000). Separation of the two components of proton conductivity in olivine will substantially improve the current proton conduction model. It will help to interpret magnetotelluric data and will give prospects to find new mineral sources and explain other phenomena such as volcanism and plate tectonics. A recent insight is that the high conductivities determined from proton conduction measurements at low temperatures are mainly due to conduction along grain boundaries (Demouchy 2010). We have repeated Demouchy (2010) experiment using neutron imaging to image time and temperature dependent hydrogen diffusion profiles as neutrons are highly sensitive to hydrogen. We carried out a series of experiments where we diffused H2O through a forsterite polycrystalline matrix at high-pressure and temperature. The recovered samples were imaged using the DINGO neutron tomography facility at the Australian Centre for Neutron Scattering. The results indicate hydrogen transport inside the forsterite aggregates as changing neutron attenuation along the diffusion direction of the polycrystalline mineral block. It correlates with the temperature dependent hydrogen diffusion in this mineral. This study revealed the ability of neutron imaging technique to find the hydrogen diffusion coefficient of forsterite. We are sharing these results in this conference.en_AU
dc.identifier.articlenumberMR43C-0132en_AU
dc.identifier.citationPatabendigedara, S. K., Clark, S., M., & Salvemin, F. F. (sic). (2018). Neutron imaging for calculating hydrogen diffusivity in polycrystalline forsterite aggregates. Paper presented at the AGU Fall Meeting, Washington, D. C., 10 to 14 December 2018. Retrieved from: https://agu.confex.com/agu/fm18/meetingapp.cgi/Paper/372315en_AU
dc.identifier.conferenceenddate14 December 2014en_AU
dc.identifier.conferencenameAGU Fall Meetingen_AU
dc.identifier.conferenceplaceWashington, D.C., USAen_AU
dc.identifier.conferencestartdate10 December 2014en_AU
dc.identifier.otherMR43C-0132en_AU
dc.identifier.urihttps://agu.confex.com/agu/fm18/meetingapp.cgi/Paper/372315en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15121en_AU
dc.language.isoenen_AU
dc.publisherAmerican Geophysical Unionen_AU
dc.relation.urihttps://agu.confex.com/agu/fm18/meetingapp.cgi/Paper/372315en_AU
dc.subjectHydrogenen_AU
dc.subjectDiffusionen_AU
dc.subjectMineralsen_AU
dc.subjectEarth mantleen_AU
dc.subjectMaterialsen_AU
dc.subjectVolcanismen_AU
dc.subjectPlate tectonicsen_AU
dc.subjectANSTOen_AU
dc.subjectTomographyen_AU
dc.subjectGrain boundariesen_AU
dc.titleNeutron imaging for calculating hydrogen diffusivity in polycrystalline forsterite aggregatesen_AU
dc.typeConference Paperen_AU
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