Microstructural analysis of ZnO powders with different concentrations of Al dopant obtained by means of hydrothermal synthesis

Viorel Malinovschi 1Catalin Ducu 1Gabriela Plaiasu 1Marioara Abrudeanu 1Sorin G. Moga 1Robert R. Piticescu 2Claude J. Monty 3

1. University of Pitesti, Pitesti, Romania
2. Institute for Non-ferrous and Rare Metals, 102 Biruintei Blvd., Pantelimon 73957, Romania
3. CNRS laboratoire Procedes, Materiaux et Energie solaire (PROMES), BP5 Odeillo, Font-Romeu 66120, France

Abstract

The ZnO powders were obtained by means of hydrothermal synthesis using ZnNO3 as precursor and NaOH as hydrolysis agent. The hydrothermal synthesis was performed in a Cortest autoclave at the following parameters: temperature of 2000C, pressure of 4.5 bars and time of 120 minutes. The precipitates have been filtered, washed with distillate water and dried at 1100C for few hours. The samples obtained by means of hydrothermal synthesis have been used as precursors in a vapour-condensation treatment in a solar reactor. Three types of samples were investigated: pure ZnO, ZnO doped with 0.05wt% Al and ZnO doped with 2.5wt% Al. The powder samples have been analyzed using different X-ray diffraction methods: Williamson Hall plot, Warren-Averbach, double-Voigt and Rietveld refinement. Qualitative phase analysis confirmed the existence of the ZnO hexagonal phase. No Al phase has been identified in the X-ray diffraction pattern. In all the cases nanocrystalline ZnO was obtained. The vapour-condensation treatment has enhanced the diminution of microstrain. Scanning electron microscopy was performed and the results were used for completing the X-ray diffraction analysis.

 

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Presentation: Poster at E-MRS Fall Meeting 2007, Symposium B, by Sorin G. Moga
See On-line Journal of E-MRS Fall Meeting 2007

Submitted: 2007-05-22 14:05
Revised:   2009-06-07 00:44