Imaging the Kirkendall effect in pyrite (FeS2) thin films: cross-sectional microstructure and chemical features
Entity
UAM. Departamento de Física Aplicada; UAM. Departamento de Física de MaterialesPublisher
ElsevierDate
2020-12-21Citation
10.1016/j.actamat.2020.116582
Acta Materialia 205 (2021): 116582
ISSN
1359-6454 (print)DOI
10.1016/j.actamat.2020.116582Funded by
Members of MIRE Group acknowledge the financial support of the Spanish MICINN under project RTI2018-099794-B-I00. E. Flores acknowledges the intramural CSIC project 2D-MeSes funding and the service from the MiNa Laboratory at IMN, and funding from CM (project SpaceTec, S2013/ICE2822), MINECO (project CSIC13-4E1794) and EU (FEDER,FSE). Financial support through the project UMA18-FEDERJA-041 is gratefully acknowledgedProject
Gobierno de España. RTI2018-099794-B-I00; Gobierno de España. CSIC13-4E1794Editor's Version
https://doi.org/10.1016/j.actamat.2020.116582Subjects
Cross-section; Kirkendall effect; Pyrite; Sodium doping; TEM; FísicaRights
© 2020 Acta Materialia Inc. Published by Elsevier Ltd.Esta obra está bajo una licencia de Creative Commons Reconocimiento-NoComercial-SinObraDerivada 4.0 Internacional.
Abstract
This investigation provides novel data on the structure and chemical composition of pyrite thin films and new hints concerning their formation mechanism. From TEM-HAADF data, it has been found that the films are composed of two different layers: one is very compact and the other one is quite porous with many voids separating a few groups of grains. This porous layer is always in direct contact with the substrate, and its thickness is quite similar to that of the original Fe film. The average size of pyrite grains is equal in both layers, what suggests that the same process is responsible for their formation. Concentration profiles of sulfur, iron and some impurities (mainly sodium and oxygen from the glass substrate) through both layers are given in this work, and thus chemical inhomogeneities of the films are proved by the obtained stoichiometric ratios (S/Fe). Moreover, Na from sodalime glass substrates mainly accumulates at the pyrite grain boundaries and barely dopes them. The obtained results support the hypothesis that the iron sulfuration process essentially induces the diffusion of iron atoms, what leads to the porous layer formation as a manifestation of the Kirkendall Effect. Therefore, it seems that the same mechanisms that operate in the synthesis of surface hollow structures at the nanoscale are also active in the formation of pyrite thin films ranging from several tens to hundreds of nanometers
Files in this item
Google Scholar:Morales, Carlos
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Leinen, Dietmar
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Flores, Eduardo
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Muñoz-Cortes, Esmeralda
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Leardini, Fabrice
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Ares Fernández, José Ramón
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Flege, Jan Ingo
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Soriano Guillén, Leandro
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Ferrer, Isabel J.
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Sánchez López, Carlos
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