Files in this item
Hydrogen and deuterium diffusion in non-stoichiometric spinel
Item metadata
dc.contributor.author | Bromiley, Geoffrey D. | |
dc.contributor.author | Brooke, Jennifer | |
dc.contributor.author | Kohn, Simon C. | |
dc.date.accessioned | 2019-11-13T15:30:08Z | |
dc.date.available | 2019-11-13T15:30:08Z | |
dc.date.issued | 2017-07-12 | |
dc.identifier | 262930108 | |
dc.identifier | d9f53090-1798-4084-9501-86006491555b | |
dc.identifier | 85023782034 | |
dc.identifier.citation | Bromiley , G D , Brooke , J & Kohn , S C 2017 , ' Hydrogen and deuterium diffusion in non-stoichiometric spinel ' , High Pressure Research , vol. 37 , no. 3 , pp. 360-376 . https://doi.org/10.1080/08957959.2017.1353091 | en |
dc.identifier.issn | 0895-7959 | |
dc.identifier.other | ORCID: /0000-0003-1611-8954/work/64361435 | |
dc.identifier.uri | https://hdl.handle.net/10023/18915 | |
dc.description.abstract | High pressure/temperature annealing experiments are used to determine diffusivities of H+ and D+ in non-stoichiometric spinel, a low-pressure analogue for nominally anhydrous minerals in Earth’s mantle. Data are fitted to the following Arrhenius law: Diffusivity (m2/s) = 4 ± 1 × 10−12 exp(−54 ± 2 kJ mol−1/RT). At low temperatures, H+ and D+ diffusion in non-stoichiometric spinel is charge balanced by flux of O vacancies, with infrared data consistent with protonation of both octahedral and tetrahedral O–O edges in non-stoichiometric spinel, and additional fine structure due to Mg–Al mixing and/or coupling of structurally incorporated H+ with cation vacancies. Absence of changes in the fine structure of O–H absorption bands indicates that H+ can become locally coupled and uncoupled to other defects during bulk diffusion. As such, proton conductivity in spinel group minerals, arising from faster flux of uncoupled H+, can only be calculated from H+ mobility data if the extent of defect coupling is constrained. | |
dc.format.extent | 2325349 | |
dc.language.iso | eng | |
dc.relation.ispartof | High Pressure Research | en |
dc.subject | Spinel | en |
dc.subject | Hydrogen | en |
dc.subject | Deuterium | en |
dc.subject | Diffusion | en |
dc.subject | Mantle | en |
dc.subject | GE Environmental Sciences | en |
dc.subject | NDAS | en |
dc.subject.lcc | GE | en |
dc.title | Hydrogen and deuterium diffusion in non-stoichiometric spinel | en |
dc.type | Journal article | en |
dc.contributor.institution | University of St Andrews. School of Earth & Environmental Sciences | en |
dc.identifier.doi | https://doi.org/10.1080/08957959.2017.1353091 | |
dc.description.status | Peer reviewed | en |
This item appears in the following Collection(s)
Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.