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

Abstract Lithium tetraborate glass samples containing Chromium and Neodymium were prepared. The density, molar volume, Oxygen packing density and N 4 indicate the glass samples containing 0.25 and 0.75 mol% Nd 2 O 3 have 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 Ω 2 , Ω 4 and Ω 6 for glass. Chromium and Neodymium addition a gradual conversion of chromium ions from Cr 6+ ion to Cr 3+ ion acts as modifiers breaking up local symmetry and introduces coordinated bond defects in these glasses, which effect on the environment around the Nd 3+ ions. The large Ω 2 value suggests a lower symmetric coordination around the Nd 3+ and they attract Nd 3+ cations to form various B O Nd bonds. The deviation parameters δ rms , was determined. The hypersensitive transition, found to be 4 f 9/2  →  4 G 5/2  + 2 G 7/2 .