Study of XANES as used for determining the near-n eighbour distances in some cobalt systems

X-r ay cobalt K-a bsorption edges in the cobalt systems CoO, CoAl2O4, CoMoO4, Co(NO3)2 · 6 H2O, Co(C2H3O2)2 · 4 H2O, bieberite (CoSO4 mineral form), CoSO4 · 7 H2O, Co(CHO2)2 · 2 H2O are studied using a Cauchois-t ype X-r ay spectrograph. The three XANES structures A, B, and C are observed in the spectra of these systems. The formula, proposed by Mahto and Chetal, is applied to XANES structures A and C to determine the near-n eighbour distance in the above systems. The results obtained agree fairly well with the crystallographic values.