Study of corrosion-protected AIN samples by X-ray photoelectron spectroscopy and diffuse reflectance IR Fourier transform spectroscopy

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Abstract
The surface composition of AIN samples exposed to atmospheric air has been studied by X-ray photoelectron spectroscopy (XPS) and diffuse reflectance IR Fourier transform spectroscopy (DRIFTS) as a function of their preparation method. AIN samples have been obtained either by direct reaction of NH3 with Al2O3 at 1300 °C or by nitridation of aluminium metal with N2 in the presence of CaCO3 at lower temperatures. The addition of CaCO3 leads to the formation of a CaCO3 thin layer at the surface of the nitride particles that both inhibits the atmospheric corrosion and favours the sintering of the nitride powder.