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Magnetic Properties of ZnO:Ni Aerogel Nanopowders: Effect of Thermal Treatments
Published online by Cambridge University Press: 01 February 2011
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.
- 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