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Morphology and microstructural properties of TiO2 nanopowders doped with trivalent Al and Ga cations

Published online by Cambridge University Press:  31 January 2011

L. E. Depero ,
A. Marino ,
B. Allieri ,
E. Bontempi ,
L. Sangaletti ,
C. Casale  and
M. Notaro
L. E. Depero
Affiliation:
Istituto Nazionale per la Fisica della Materia and Dipartimento di Meccanica, Università di Brescia, Via Branze 38, 25133 Brescia, Italy
A. Marino
Affiliation:
Istituto Nazionale per la Fisica della Materia and Dipartimento di Meccanica, Università di Brescia, Via Branze 38, 25133 Brescia, Italy
B. Allieri
Affiliation:
Istituto Nazionale per la Fisica della Materia and Dipartimento di Meccanica, Università di Brescia, Via Branze 38, 25133 Brescia, Italy
E. Bontempi
Affiliation:
Istituto Nazionale per la Fisica della Materia and Dipartimento di Meccanica, Università di Brescia, Via Branze 38, 25133 Brescia, Italy
L. Sangaletti
Affiliation:
Istituto Nazionale per la Fisica della Materia and Dipartimento di Matematica e Fisica, Università Cattolica del Sacro Cuore, Via Trieste 17, 25121 Brescia, Italy
C. Casale
Affiliation:
Ente Nazionale per l'Energia Elettrica, Struttura Ricerca, Via Reggio Emilia 39, 20090 Segrate, Italy
M. Notaro
Affiliation:
Ente Nazionale per l'Energia Elettrica, Struttura Ricerca, Via Reggio Emilia 39, 20090 Segrate, Italy
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Abstract

The effects of doping on the morphological and microstructural properties of TiO2 nanopowders produced by laser pyrolysis were investigated mainly by x-ray diffraction (XRD) and electron microscopy. Samples of TiO2 powders were prepared by doping with different trivalent cations (Al and Ga). The powders were calcined at different temperatures in the range 400–1000 °C for 18 h, as well as at constant T = 700 °C up to 160 h. After each thermal treatment, XRD patterns were collected. The analysis of XRD patterns allowed us to estimate the microstrains and average crystallite size and to observe the evolution of the microstructural parameters with temperature. Both Al and Ga inhibited the crystallite growth of TiO2 anatase and the rutile phases, this effect being larger in the Al-doped powders.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 10 , October 2000 , pp. 2080 - 2086
Copyright
Copyright © Materials Research Society 2000

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