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Sintering of hierarchically structured ZnO

König, Markus and Höhn, Sören and Hoffmann, Rudolf and Suffner, Jens and Lauterbach, Stefan and Weiler, Ludwig and Guillon, Olivier and Rödel, Jürgen (2010):
Sintering of hierarchically structured ZnO.
In: Journal of Materials Research, Cambridge University Press, pp. 2125-2134, 25, (11), ISSN 0884-2914,
[Online-Edition: http://dx.doi.org/10.1557/JMR.2010.0288],
[Article]

Abstract

Hierarchically structured zinc oxide was prepared from zinc acetylacetonate by a microwave-assisted process. The zinc oxide formed nanoparticles that are packed in substructured spherical agglomerates with a diameter of 0.5 μm. Nitrogen adsorption, x-ray diffraction, and dilatometry were used to investigate the densification. Ion beam method was applied to prepare cross sections and enable microstructural analysis. Three regimes of microstructural evolution were identified on different scales during sintering. In the first regime, nanoparticles changed morphology and densification occurred only in the interiors of the agglomerates. In the second regime, agglomerates became hollow and built necks. Simultaneously, densification set in on the macroscopic scale. A drastic homogenization of the microstructure was observed that marked the beginning of the third regime, where densification and grain growth occurred.

Item Type: Article
Erschienen: 2010
Creators: König, Markus and Höhn, Sören and Hoffmann, Rudolf and Suffner, Jens and Lauterbach, Stefan and Weiler, Ludwig and Guillon, Olivier and Rödel, Jürgen
Title: Sintering of hierarchically structured ZnO
Language: English
Abstract:

Hierarchically structured zinc oxide was prepared from zinc acetylacetonate by a microwave-assisted process. The zinc oxide formed nanoparticles that are packed in substructured spherical agglomerates with a diameter of 0.5 μm. Nitrogen adsorption, x-ray diffraction, and dilatometry were used to investigate the densification. Ion beam method was applied to prepare cross sections and enable microstructural analysis. Three regimes of microstructural evolution were identified on different scales during sintering. In the first regime, nanoparticles changed morphology and densification occurred only in the interiors of the agglomerates. In the second regime, agglomerates became hollow and built necks. Simultaneously, densification set in on the macroscopic scale. A drastic homogenization of the microstructure was observed that marked the beginning of the third regime, where densification and grain growth occurred.

Journal or Publication Title: Journal of Materials Research
Volume: 25
Number: 11
Publisher: Cambridge University Press
Uncontrolled Keywords: Densification; Microstructure; Nanoscale
Divisions: 11 Department of Materials and Earth Sciences > Earth Science > Geo-Material-Science
11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Earth Science
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 14 Jun 2011 12:09
Official URL: http://dx.doi.org/10.1557/JMR.2010.0288
Identification Number: doi:10.1557/JMR.2010.0288
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