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The behaviour of the specular reflectance of several oxides on metals (Cr,O, on Cr, Cu,O on Cu) has bee0 studied theoretically and experimentally in the infrared region. Theoretical and experimental spectra are in accordance with each other. The results obtained on pure metals are applied to the study of 80 Ni-U) Cr and 55 Cu-45 Ni alloys in order to identify the oxides grown on the surface during thermal oxidation.

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The study of the oxidation of copper at low temperatures shows that the metal is not recovered by a pure stoicbiametric Cu,O but by a copper(I) oxide phase with the same crystalline structure as Cu,O, and that this phase exhibits a very large non-stoichiometry (composition between Cu,,O,, and CU,,~,,). These results explain that the U V -V i M R spectra are different from those of high-purity Cu,O crystals and the position of the absorption bands attributable to defects could be justified easily by the Bohr theory of tbe hydrogen atom applied to semi-C O n d~O T s .

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