FTIR imaging in diffusion studies: CO2 and H2O in a synthetic sector-zoned beryl

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dc.identifier.uri http://dx.doi.org/10.15488/1065
dc.identifier.uri http://www.repo.uni-hannover.de/handle/123456789/1089
dc.contributor.author Della Ventura, Giancarlo
dc.contributor.author Radica, Francesco
dc.contributor.author Bellatreccia, Fabio
dc.contributor.author Cavallo, Andrea
dc.contributor.author Cinque, Gianfelice
dc.contributor.author Tortora, Luca
dc.contributor.author Behrens, Harald
dc.date.accessioned 2017-01-27T08:36:52Z
dc.date.available 2017-01-27T08:36:52Z
dc.date.issued 2015
dc.identifier.citation Della Ventura, G.; Radica, F.; Bellatreccia, F.; Cavallo, A.; Cinque, G. et al.: FTIR imaging in diffusion studies: CO2 and H2O in a synthetic sector-zoned beryl. In: Frontiers in Earth Sciences 3 (2015), S. 1-11. DOI: https://doi.org/10.3389/feart.2015.00033
dc.description.abstract In this work we investigate the strongly inhomogeneous distribution of CO2 and H2O in a synthetic beryl having a peculiar hourglass zoning of Cr due to the crystal growth. The sample was treated at 800°C, 500 MPa, in a CO2-rich atmosphere. High-resolution FESEM images revealed that the hourglass boundary is not correlated to physical discontinuities, at least at the scale of tens of nanometers. Polarized FPA-FTIR imaging, on the other side, revealed that the chemical zoning acts as a fast pathway for carbon dioxide diffusion, a feature never observed so far in minerals. The hourglass zone boundary may be thus considered as a structural defect possibly due to the mismatch induced by the different growth rates of each sector. High-resolution synchrotron-light FTIR imaging, in addition, also allows enhancement of CO2 diffusion along the hourglass boundary to be distinguished from diffusion along fractures in the grain. Therefore, FTIR imaging provides evidence that different diffusion mechanisms may locally combine, suggesting that the distribution of the target molecules needs to be carefully characterized in experimental studies. This piece of information is mandatory when the study is aimed at extracting diffusion coefficients from analytical profiles. Combination of TOF-SIMS and FPA data shows a significant depletion of type II H2O along the hourglass boundary, indicating that water diffusion could be controlled by the distribution of alkali cations within channels, coupled to a plug effect of CO2. © 2015 Della Ventura, Radica, Bellatreccia, Cavallo, Cinque, Tortora and Behrens. eng
dc.language.iso eng
dc.publisher Lausanne : Frontiers Research Foundation
dc.relation.ispartofseries Frontiers in Earth Sciences 3 (2015)
dc.rights CC BY 4.0
dc.rights.uri https://creativecommons.org/licenses/by/4.0/
dc.subject Beryl eng
dc.subject CO2 diffusion eng
dc.subject EMPA eng
dc.subject FESEM eng
dc.subject FTIR-FPA imaging eng
dc.subject Hourglass zoning eng
dc.subject Synchrotron radiation eng
dc.subject TOF-SIMS eng
dc.subject.ddc 550 | Geowissenschaften ger
dc.title FTIR imaging in diffusion studies: CO2 and H2O in a synthetic sector-zoned beryl
dc.type article
dc.type Text
dc.relation.essn 2296-6463
dc.relation.issn 1863-4621
dc.relation.doi https://doi.org/10.3389/feart.2015.00033
dc.bibliographicCitation.volume 3
dc.bibliographicCitation.firstPage 1
dc.bibliographicCitation.lastPage 11
dc.description.version publishedVersion
tib.accessRights frei zug�nglich


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