Nanocrystalline ceramic and composite materials present a set of highly improved and novel mechanical, electronic, optical, catalytic or bioactive properties over the traditional materials. The implementation and utilisation of these new materials is strongly dependent on the microstructure and surface nanochemistry characteristics investigation and modelling. New processes for the synthesis and sintering are required to be developed to control and optimize the chemical composition, component distribution, crystalline and grain sizes;
In our paper we present some results on the synthesis of Al – doped nanomaterials via two routes: hydrothermal synthesis and vaporisation – condensation in a solar furnace.
The influence of the synthesis parameters on the nanopowders characteristics is discussed and results are compared with thermodynamic predictive calculations.
The evolution of mean crystallite sizes of powders obtained in the two synthesis routes is modelled.
Pressed pellets made from the hydrothermal synthesized powders were used to deposit thin films by RF sputtering. Some characteristic properties of these films are finally presented.

The authors acknowledge the support received in the frame of an ECO-NET Project managed by EGIDE –France, FP6 Infrastructure Project SOLFACE and a NATO fellowship.

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