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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