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

•We prepare Lithium tetraborate glass samples by the quenched method as bulk.•The effects of addition Nd and Cr oxide on the optical properties of Lithium tetraborate glass are studied.•The glass samples containing 0.25 and 0.75 mol% Nd2O3 have the opening structure.•The hypersensitive transition, 4f9/2 → 4G5/2 + 2G7/2, is closely related to Ω2 parameter.•The Ω2 > Ω6 > Ω4 for all glass sample except sample containing 0.5 mol% of Nd.

Lithium tetraborate glass samples containing Chromium and Neodymium were prepared. The density, molar volume, Oxygen packing density and N4 indicate the glass samples containing 0.25 and 0.75 mol% Nd2O3 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 Ω2, Ω4 and Ω6 for 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 Ω2 value suggests a lower symmetric coordination around the Nd3+ and they attract Nd3+ cations to form various BONd bonds. The deviation parameters δrms, was determined. The hypersensitive transition, found to be 4f9/2 → 4G5/2 +2G7/2.

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