Investigations on Spectroscopic Properties of Manganese Ions in Sodium Lead Alumino Borate Glasses

Abstract

Abstract Divalent manganese ions containing 20Na2O-15PbO-(5-x)Al2O3-60B2O3:xMnO2 (x ranging from 0 to 1 mol%) NPAB glasses are prepared by using melt quenching technique and are characterized by several spectroscopic techniques. Various physical parameters are calculated from the measured density values. Structural properties of MnO2 doped NPAB glasses are investigated by Powder XRD, EPR, UV-VIS absorption and FT-IR spectroscopic techniques. The amorphous nature of prepared glass samples are confirmed by X- ray diffraction spectra. EPR spectra of these glasses exhibited a well resolved six line hyperfine structure around g = 2.00 is the characteristic nature of Mn(II) ions in distorted octahedral site symmetry. Optical absorption spectra of these glasses revealed a single broad band at  21000 cm-1 which has been assigned to the transition 6A1g(S) → 4T1g(G) of Mn(II) ions. Optical band gap energies and Urbach energies are evaluated through the fundamental Ultra Violet absorption edges of the glasses. FT-IR spectra clearly exhibited different vibrational bands and assigned to borate groups and water molecules.