Nanostructured nitride powders synthesi

The surfaces of oxide nanopowders have been extensively studied either for characterization purposes or for potential catafytic properties investigatioa As for non-oxide ceramic powders, references on their surface studies are scarce. Due to hydrolysis in ambient atmosphere, the unavoidable presence of oxygen in the first atomic layer of these nanostructured powders may drastically modify their expected properties. After briefly introducing our characterization technique of nanosized powder sur ces, we will present as an exan le, the Fourier transform infixed (FT-IR) sur ce analysis of a nanostructured aluminum nitride powder obtained via sol-gel type chemical synthesis. 

The Synthesis of Nanostructural SHS-Az Powders 249 Table 8.2 The results of synthesis of titanium nitride. 

Titova, Y.V., Shiganova, L.A., Maydan, D.S., and Bichurov, G.V. (2012) The self-propagating high-temperature synthesis of nanostructural powder of aluminium nitride using aluminium fluoride and sodium azide. Izvestia Vuzov. PMiFP, (3), 25-29. 

Carbothermal route provides a general method for preparing crystaUine nanowires of oxides such as ZnO, Al Oj and Ga Oj, nitrides such as AIN and SijN, and carbides such as SiC [3], The set-up employed for the synthesis of oxide nanomaterials is shown in Figure 3.1. The method has enabled the synthesis of crystalhne nanowires of both silica and sihcon. In the case of GaN, it has been possible to dope it with Mn, Mg and Si to bestow useful optical and magnetic properties. Carbothermal reaction involving Ga Oj powder mixed with activated carbon or carbon nanotubes carried out at 1100 °C in flowing Ar yields nanowires, nanorods as well as novel nanostructures... 

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