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Yttria-based nano-sized powders: A new class of fractal materials obtained by combustion synthesis

Published online by Cambridge University Press:  31 January 2011

Giuliano Fagherazzi ,
Stefano Polizzi ,
Marco Bettinelli  and
Adolfo Speghini
Giuliano Fagherazzi
Affiliation:
Department of Physical Chemistry, University of Venezia, DD2137, 30123 Venezia, Italy
Stefano Polizzi
Affiliation:
Department of Physical Chemistry, University of Venezia, DD2137, 30123 Venezia, Italy
Marco Bettinelli
Affiliation:
Department of Science and Technology, University of Verona, 37134 Verona, Italy
Adolfo Speghini
Affiliation:
Department of Science and Technology, University of Verona, 37134 Verona, Italy
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Abstract

Small-angle x-ray scattering (SAXS) technique has been used to investigate nano-sized powders of Y2O3, Y1.8Er0.2O3, and Y1.8Nd0.2O3, obtained by means of combustion synthesis. The results show that the powders have a mass-fractal behavior, with fractal dimension, Df, in the 1.7–1.8 range, and average particle sizes in the 20–30-nm range. These results are supported by transmission electron microscope observations. Moreover, from SAXS data, it has been possible to establish a narrow particle size polydispersity, as well as the presence of particle-diffuse or “fuzzy” interfaces. These results show, for the first time, the fractal behavior of materials prepared by combustion synthesis and are in agreement with a recently developed model. The nanostructural features are discussed within the framework of the peculiar optical properties of the doped luminescent materials.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 3 , March 2000 , pp. 586 - 589
Copyright
Copyright © Materials Research Society 2000

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