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Local Structural Disorder and Relaxation in SnO2Nanostructures Studied by119Sn MAS NMR and119Sn Mössbauer Spectroscopy

Indris, Sylvio and Scheuermann, Marco and Becker, Sebastian M. and Šepelák, Vladimir and Kruk, Robert and Suffner, Jens and Gyger, Fabian and Feldmann, Claus and Ulrich, Anne S. and Hahn, Horst (2011):
Local Structural Disorder and Relaxation in SnO2Nanostructures Studied by119Sn MAS NMR and119Sn Mössbauer Spectroscopy.
In: The Journal of Physical Chemistry C, ACS Publications, pp. 6433-6437, 115, (14), ISSN 1932-7447, [Online-Edition: http://dx.doi.org/10.1021/jp200651m],
[Article]

Abstract

We studied the local structural disorder and relaxation in different nanostructures of SnO2 by using 119Sn MAS NMR in combination with 119Sn Mössbauer spectroscopy. We investigated nanocrystalline powders with an average crystallite size of 8 nm as well as hollow spheres with a wall thickness of 3 nm and a diameter of 14 nm, and compared the results to coarse-grained materials. Whereas the uniform SnO6 octahedra in the coarse-grained material show a well-known distortion and thus large electric field gradients, the nanocrystalline SnO2 exhibits a structural relaxation leading to a distribution of local environments and more symmetric octahedra. The SnO2 hollow spheres show strong local disorder in combination with highly asymmetric environments around the Sn atoms.

Item Type: Article
Erschienen: 2011
Creators: Indris, Sylvio and Scheuermann, Marco and Becker, Sebastian M. and Šepelák, Vladimir and Kruk, Robert and Suffner, Jens and Gyger, Fabian and Feldmann, Claus and Ulrich, Anne S. and Hahn, Horst
Title: Local Structural Disorder and Relaxation in SnO2Nanostructures Studied by119Sn MAS NMR and119Sn Mössbauer Spectroscopy
Language: English
Abstract:

We studied the local structural disorder and relaxation in different nanostructures of SnO2 by using 119Sn MAS NMR in combination with 119Sn Mössbauer spectroscopy. We investigated nanocrystalline powders with an average crystallite size of 8 nm as well as hollow spheres with a wall thickness of 3 nm and a diameter of 14 nm, and compared the results to coarse-grained materials. Whereas the uniform SnO6 octahedra in the coarse-grained material show a well-known distortion and thus large electric field gradients, the nanocrystalline SnO2 exhibits a structural relaxation leading to a distribution of local environments and more symmetric octahedra. The SnO2 hollow spheres show strong local disorder in combination with highly asymmetric environments around the Sn atoms.

Journal or Publication Title: The Journal of Physical Chemistry C
Volume: 115
Number: 14
Publisher: ACS Publications
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
Date Deposited: 31 Jan 2014 10:24
Official URL: http://dx.doi.org/10.1021/jp200651m
Identification Number: doi:10.1021/jp200651m
Funders: We are grateful to the German Ministry for Education and Research as well as to the DFG Center for Functional Nanostructures (CFN) at the Karlsruhe Institute of Technology (KIT) for financial support., J.S. and H.H. are grateful for financial support by the State of Hesse.
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