Preparation and characterisation by XRD and TEM of ZnO based magnetic helionanos

Claude J. Monty 3,  Jules KOUAM ,  Adrian M. Motoc 1,  Francois SIBIEUDE ,  Benjamin MARTINEZ ,  Felipe SANDIUMENGE ,  Lluis BALCELLS ,  Jordi Arbiol 2,4

1. Institute for Non-ferrous and Rare Metals, 102 Biruintei Blvd., Pantelimon 73957, Romania
2. Electronics Department, University of Barcelona, C\ Martí i Franqu?s, Barcelona 08028, Spain
3. CNRS laboratoire Procedes, Materiaux et Energie solaire (PROMES), BP5 Odeillo, Font-Romeu 66120, France
4. Serveis Cientificotècnics, University of Barcelona (SCT-UB), Lluis Sole i Sabaris, 1-3, Barcelona 08028, Spain

Abstract

M (M=Co, Mn, Fe) doped ZnO nanophases (0D-NANOS and 1D-NANOS) have been prepared by vaporisation-condensation in a solar reactor (helionanos formed by solar PVD) from targets of known initial composition.
The heliophases and initial powders have been characterized by X-Ray Diffraction analysis (XRD) and Transmission Electron Microscopy (TEM).
A detailed analysis of the XRD spectrum has been performed to estimate :
1 - diffraction peaks position shifts and shape anomalies
2 - the average size of coherency domains (nanophases average grain size)
The first point led to discuss eventual variations of the lattice parameter as a function of composition, presence of stresses and distribution of grain sizes.
The second point led to discuss the influence of parameters such as the initial composition and the pressure inside the reactor during the solar PVD process.
Magnetic properties of 0D-NANOS-Zn1-xCoxO have been studied : these nanomaterials exhibit an original behaviour which will be discussed.

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Presentation: poster at E-MRS Fall Meeting 2005, Laser Ceramic Symposium, by Claude J. Monty
See On-line Journal of E-MRS Fall Meeting 2005

Submitted: 2005-08-02 14:54
Revised:   2005-08-02 15:08
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