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

Download statistics - Document (COUNTER):

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

Repository version

To cite the version in the repository, please use this identifier: https://doi.org/10.15488/1065

Selected time period:

year: 
month: 

Sum total of downloads: 100




Thumbnail
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.
License of this version: CC BY 4.0
Document Type: article
Publishing status: publishedVersion
Issue Date: 2015
Appears in Collections:Naturwissenschaftliche Fakultät

distribution of downloads over the selected time period:

downloads by country:

pos. country downloads
total perc.
1 image of flag of Germany Germany 92 92.00%
2 image of flag of Mexico Mexico 2 2.00%
3 image of flag of Netherlands Netherlands 1 1.00%
4 image of flag of India India 1 1.00%
5 image of flag of France France 1 1.00%
6 image of flag of China China 1 1.00%
7 image of flag of Switzerland Switzerland 1 1.00%
8 image of flag of Brazil Brazil 1 1.00%

Further download figures and rankings:


Hinweis

Zur Erhebung der Downloadstatistiken kommen entsprechend dem „COUNTER Code of Practice for e-Resources“ international anerkannte Regeln und Normen zur Anwendung. COUNTER ist eine internationale Non-Profit-Organisation, in der Bibliotheksverbände, Datenbankanbieter und Verlage gemeinsam an Standards zur Erhebung, Speicherung und Verarbeitung von Nutzungsdaten elektronischer Ressourcen arbeiten, welche so Objektivität und Vergleichbarkeit gewährleisten sollen. Es werden hierbei ausschließlich Zugriffe auf die entsprechenden Volltexte ausgewertet, keine Aufrufe der Website an sich.

Search the repository


Browse