E.p.r. and optical absorption of Mn2+ ions in ternary K2SO4 − Na2SO4-ZnSO4 glasses

Abstract

Electron paramagnetic resonance (e.p.r.) and optical absorption measurements were performed on K2SO4 − Na2SO4-ZnSO4 glasses containing 1–10 mol % of MnSO4·H2O. The spectra of Mn2+-doped samples exhibit a sextet centred at g = 2.03. The e.p.r. signal clearly shows its dependence on the dopant ion concentration. The optical absorption spectrum at room temperature shows bands characteristic of Mn2+ ions in octahedral symmetry. The crystal field (Dq) and the Racah interelectronic repulsion (B and C) parameters have been evaluated. E.p.r. and optical absorption studies reveal that the Mn2+ ions go substitutionally to Zn ion sites and the site symmetry around the transition metal ion is octahedral.