Structural studies of copper doped 2TeO-PbO-AgO glass by FT-IR and Raman spectroscopies
Résumé
The FT-IR absorption and Raman scattering were used in order to obtain information concerning the short range order in CuO(100-)[ 2TeOPbO0.2AgO] (0 5 mol%) glasses. Moreover, the changes in tellurium atoms coordination that occurs with copper oxide addition were followed. Both techniques reveal that tellurium is disposed in the network structure in trigonal bipyramids (TeO, trigonal pyramids (TeO along with TeO polyhedra units. Increasing the CuO content in the glasses changes the coordination of tellurium atoms from 4 to 3 through the so-called 3+1 intermediate units, simultaneously with the increase of the non-bridging oxygen (NBOs) ions amount causing a depolymerization process in the glass structure.
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