EPR, Infrared and Optical Absorption Studies of Cu2+ Ion Doped in LiF-Li2O-SrO-Bi2O3 Glasses

Abstract

EPR, IR and optical absorption studies on xLiF-(50-x)Li₂O-20SrO-30Bi₂O₃  (where x= 0, 5, 10, 15, and 20) glasses containing Cu²⁺ spin probe have been carried out. The IR results prove the distribution of trigonal pyramids (BiO₆) which determines the network and the distribution of borate triangles (BiO₃) and borate tetrahedral (BiO₆) groups. EPR results show that the g_{|| >} g_^ indicating that the Cu²⁺ ion is in tetragonal distorted octahedral site and its ground state is _. There are considerable changes in g_||, g_^ and A_|| values with the increasing with  increses of LiF content. The optical absorption spectra results show that the absorption peak of Cu²⁺ is a function of composition. Bonding parameters are calculated from both optical and EPR data. All these variations clearly indicate the structural changes in the present glass systems with varying LiF content.