Structural and optical properties of lithium tetraborate glasses containing chromium and neodymium oxide

Abstract

© 2017 Elsevier Ltd Lithium tetraborate glass samples containing Chromium and Neodymium were prepared. The density, molar volume, Oxygen packing density and N4indicate the glass samples containing 0.25 and 0.75 mol% Nd2O3have the opening glass structure. From the absorption spectra of glass samples the Judd-Ofelt theory has been applied to the measured oscillator strengths and determines the three phenomenological intensity parameters Ω2, Ω4and Ω6for glass. Chromium and Neodymium addition a gradual conversion of chromium ions from Cr6+ion to Cr3+ion acts as modifiers breaking up local symmetry and introduces coordinated bond defects in these glasses, which effect on the environment around the Nd3+ions. The large Ω2value suggests a lower symmetric coordination around the Nd3+and they attract Nd3+cations to form various B[sbnd]O[sbnd]Nd bonds. The deviation parameters δrms, was determined. The hypersensitive transition, found to be4f9/2 → 4G5/2 +2G7/2.