Enz, Thorsten ; Theissmann, Ralf ; Hahn, Horst (2012)
Thermal degradation of microporous Sm2O3–MgO nanocomposites at isothermal conditions and surface chemical properties.
In: Journal of the European Ceramic Society, 32 (8)
doi: 10.1016/j.jeurceramsoc.2012.01.004
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The evolution of microstructural, morphological and surface chemical properties of Sm2O3–MgO nanocomposites are determined during and after isothermal heat treatments in the range of 500–1000 °C. The samples are investigated using (high temperature) X-ray diffraction, energy-filtered transmission electron microscopy including electron energy loss spectroscopy, nitrogen adsorption, and temperature programmed desorption of CO2. With small amounts of MgO the initial micropore fractions are low and mainly coarsening of Sm2O3 is observed. Large amounts of MgO result in high initial micropore fractions giving rise to enhanced densification. The different thermal degradation behaviors are explained by means of the respective characteristic diffusion distances which are determined by the volume phase fractions. The surface chemical properties of Sm2O3 and MgO remain qualitatively unchanged, however, the specific CO2 chemisorption capacities are increased through the nanocomposite formation.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2012 |
| Autor(en): | Enz, Thorsten ; Theissmann, Ralf ; Hahn, Horst |
| Art des Eintrags: | Bibliographie |
| Titel: | Thermal degradation of microporous Sm2O3–MgO nanocomposites at isothermal conditions and surface chemical properties |
| Sprache: | Englisch |
| Publikationsjahr: | Juli 2012 |
| Verlag: | Elsevier Science Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the European Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 32 |
| (Heft-)Nummer: | 8 |
| DOI: | 10.1016/j.jeurceramsoc.2012.01.004 |
| Kurzbeschreibung (Abstract): | The evolution of microstructural, morphological and surface chemical properties of Sm2O3–MgO nanocomposites are determined during and after isothermal heat treatments in the range of 500–1000 °C. The samples are investigated using (high temperature) X-ray diffraction, energy-filtered transmission electron microscopy including electron energy loss spectroscopy, nitrogen adsorption, and temperature programmed desorption of CO2. With small amounts of MgO the initial micropore fractions are low and mainly coarsening of Sm2O3 is observed. Large amounts of MgO result in high initial micropore fractions giving rise to enhanced densification. The different thermal degradation behaviors are explained by means of the respective characteristic diffusion distances which are determined by the volume phase fractions. The surface chemical properties of Sm2O3 and MgO remain qualitatively unchanged, however, the specific CO2 chemisorption capacities are increased through the nanocomposite formation. |
| Freie Schlagworte: | Grain size, Interfaces, Nanocomposites, Porosity, Thermal degradation |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Gemeinschaftslabor Nanomaterialien 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 17 Jun 2014 10:58 |
| Letzte Änderung: | 17 Jun 2014 10:58 |
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