“…The spectra reveal the presence of CuO, Cu(OH) 2, WO 2, and WO 3 , which is explained by the fact that exposure of the sample to air could not be avoided before analysis. (Gladyszewski et al, 1993;Haubold, 1992). Cu and W have fcc and bcc (body-centered cubic) structures with atomic radii of 0.1278 nm and 0.137 nm, respectively.…”