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Magnetic Properties of ZnO:Ni Aerogel Nanopowders: Effect of Thermal Treatments

Published online by Cambridge University Press:  01 February 2011

Lassaad El Mir ,
H.Jurgen von Bardeleben ,
M Saadoun ,
Aroussi Ben Mahmoud  and
Jean-Louis Cantin
Lassaad El Mir
Affiliation:
elmirlassaad@yahoo.fr, Faculté des Sciences de Gabès, Physique des matériaux et des Nanomatériaux Appliquée à l'Environnement, Gabès 6072, Tunisia
H.Jurgen von Bardeleben
Affiliation:
jurgen.vonBardeleben@insp.jussieu.fr, Université Paris 6 - UMR 7588 au CNRS, INSP, 140, rue de Lourmel, Paris, 75015, France
M Saadoun
Affiliation:
Lassaad.ElMir@fsg.rnu.tn, Faculté des Sciences de Gabès, Physique des matériaux et des Nanomatériaux Appliquée à l'Environnement, Gabès, 6072, Tunisia
Aroussi Ben Mahmoud
Affiliation:
bmaroussicamera@yahoo.com, Faculté des Sciences de Gabès, Physique des matériaux et des Nanomatériaux Appliquée à l'Environnement, Gabès, 6072, Tunisia
Jean-Louis Cantin
Affiliation:
jean-louis.cantin@insp.jussieu.fr, Université Paris 6 - UMR 7588 au CNRS, INSP, 140, rue de Lourmel, Paris, 75015, France
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Abstract

We report the elaboration of Ni doped ZnO nanoparticles prepared by a sol-gel processing technique. In our approach the water for hydrolyse was slowly released by esterification of the metal acetate with methanol followed by a supercritical drying in ethyl alcohol. Doping concentrations between 5 and 25 at% have been investigated. In the as-prepared state the powders with an average particle size of 30nm present ferromagnetic properties; thermal annealing in the 500°C to 700°C temperature range in air or oxygen modifies the magnetic properties. We ascribe the observed ferromagnetism to the presence and transformation of Ni based secondary phases.

Keywords

ferromagneticII-VIelectron spin resonance
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 957: Symposium K – Zinc Oxide and Related Materials , 2006 , 0957-K10-17
Copyright
Copyright © Materials Research Society 2007

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References

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