Abstract
X-ray diffraction (XRD), differential scanning calorimetry (DSC), Fourier transform infrared (FTIR), electron paramagnetic resonance (EPR) and optical absorption studies on 59B2O3–10K2O–(30-x)ZnO–xBaO–1CuO glasses (where x=0, 6, 12, 18, 24 and 30mol%) have been carried out. The amorphous nature of the glasses was confirmed using XRD and DSC measurements. The glass transition temperature (Tg) of glass samples has been estimated from DSC traces and found that the Tg increases with increasing BaO content. The IR studies have showed that the present glass system consists of [BO3] and [BO4] units in various borate groups. The spin-Hamiltonian parameters (SHP) such as g||, g⊥, and A|| have been determined from EPR spectra and it was found that the Cu2+ ion is in tetragonal distorted octahedral site with dx2‐y2 as the ground state. Bonding parameters and bonding symmetry of Cu2+ ions have been calculated by correlating EPR and optical data and were found to be composition dependent.
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