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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