Anomalous X-ray scattering methods, using the Cu and Mo K-absorption edges, were used to obtain local structural information on super-ionic conducting glasses with the composition: (Cu2O)0.35(MoO3)0.35(CuI)0.3. The possible atomic arrangements in the near-neighbor region of this glass were estimated by combining the results with a least-squares analysis so as to reproduce separate differential intensity profiles for Cu and Mo, as well as for the ordinary scattering profile. The coordination number of O atoms around Mo was found to be equal to 6.1 at a distance of 0.187nm. This implied that the MoO6 octahedral unit was a more probable structural entity than were MoO3 tetrahedra. A pre-peak shoulder which was observed at about 10/nm was attributed to density fluctuations that originated from MoO6 octahedral units which were connected by a corner-sharing linkage; in which the correlation length was equal to about 0.8nm. The coordination number of I- ions around Cu atoms was estimated to be equal to 4.3 at 0.261nm. This suggested the existence of an arrangement which was similar to that in molten CuI.

M.Saito, K.Sugiyama, E.Matsubara, K.T.Jacob, Y.Waseda: Materials Transactions, 1995, 36[12], 1434-9