Infrared and X-ray absorption spectra of Cu2O and CuO nanoceramics

We present the results of the study of middle infrared absorption (MIR) and X-ray absorption (XAS) spectra of nanostructured CuO and Cu2O ceramics prepared by the high pressure torsion method from coarse-grain oxide powders. We have found that the MIR bands at similar to 140 meV in CuO and Cu2O nanoceramics are associated with the presence of Cu+ and Cu2+ ions, respectively. X-ray absorption spectra indicate an appearance of extra Cu2+ and Cu+ ions in nano-Cu2O and nano-CuO ceramics, respectively.