ESR, infrared and optical absorption studies of Cu2+ ion doped in 60B(2)O(3)-10TeO(2)-(30-x)MO-xPbO (M = Zn, Cd) glasses

摘要

ESR, IR and optical absorption studies on 60B(2)O(3)-10TeO(2)-(30-x)MO-xPbO (where M=Zn, Cd) glasses containing Cu2+ spin probe have been carried out. The IR results prove the distribution of trigonal bipyramids (TeO3) which determines the network and the distribution of borate triangles (BO3) and borate tetrahedral (BO4) groups. Structural changes take place with variation of PbO content in BTZP and BTCP series. ESR results show that the g(parallel to) > g(perpendicular to) indicating that the Cu2+ ion is in tetragonal distorted octahedral site and its ground state is d(x2-y2). There are considerable changes in g(parallel to), g(perpendicular to) and A(parallel to) values with the increasing concentration of PbO in both BTZP and BTCP glass systems. The optical absorption spectra results show that the absorption peak of Cu2+ is a function of composition. The observed optical absorption peak of Cu2+ has been found to be maximum at 813 nm for x=30 mol% of PbO content. Bonding parameters are calculated from both optical and ESR data. All these variations clearly indicate the structural changes in the present glass systems with varying PbO content.