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Fractal aggregates of lanthanide-doped Y2O3 nanoparticles obtained by propellant synthesis

Published online by Cambridge University Press:  31 January 2011

Stefano Polizzi ,
Giuliano Fagherazzi ,
Marino Battagliarin ,
Marco Bettinelli  and
Adolfo Speghini
Stefano Polizzi
Affiliation:
Dipartimento di Chimica Fisica, Universita ‘di Venezia, D.D. 2137, 30123 Venezia, Italy
Giuliano Fagherazzi
Affiliation:
Dipartimento di Chimica Fisica, Universita ‘di Venezia, D.D. 2137, 30123 Venezia, Italy
Marino Battagliarin
Affiliation:
Dipartimento Scientifico e Tecnologico, Universita ‘di Verona, Ca'Vignal, Strada le Grazie 15, 37134 Verona, Italy
Marco Bettinelli
Affiliation:
Dipartimento Scientifico e Tecnologico, Universita ‘di Verona, Ca'Vignal, Strada le Grazie 15, 37134 Verona, Italy
Adolfo Speghini
Affiliation:
Dipartimento Scientifico e Tecnologico, Universita ‘di Verona, Ca'Vignal, Strada le Grazie 15, 37134 Verona, Italy
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Abstract

Y2-xLnxO3 (Ln 4 Ce, Pr, Nd, Eu, Gd, Ho, and Er) powders obtained by propellant synthesis have been characterized using small-angle x-ray scattering, wide-angle x-ray scattering, and transmission and scanning electron microscopy. All the samples showed a very porous, open microstructure with fractal scaling properties. The building blocks of the fractal aggregates are nanocrystallites of lanthanide-doped Y2O3, with variations in the cubic lattice constant proportional to the composition of the solid solution and to the lanthanide ionic radius. The particles had a narrow distribution of sizes with an average value in the 20–50 nm range. They are made of a core of 10–20 nm, consisting of almost perfectly ordered crystals and a “fuzzy” layer, characterized by either a growing lattice disorder or by a compositional gradient. From this dimension, up to at least 200 nm, the particle aggregate is a mass fractal with a fractal dimension, DMf, in the 1.6–2.0 range.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 1 , January 2001 , pp. 146 - 154
Copyright
Copyright © Materials Research Society 2001

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