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<p>The melt-quench process was employed to fabricate (50-x)Li<sub>2</sub>O-xMnO<sub>2</sub>-50B<sub>2</sub>O<sub>3</sub> glasses with varying MnO<sub>2</sub> content (0 to 20&#xa0;mol %). X-ray diffraction (XRD) confirms the amorphous nature of all glass samples. Electron Diffraction Spectra (EDS) confirms the presence of elements in the glass network. Structural analyses using Fourier-transform infrared (FTIR) and Raman spectroscopy revealed a gradual conversion of tetrahedral BO<sub>4</sub> units into trigonal BO<sub>3</sub> units with increasing MnO<sub>2</sub> content, indicating that MnO<sub>2</sub> acts as a network modifier. This modification enhances the concentration of non-bridging oxygen (NBO) sites, consistent with the observed decrease in glass transition temperature. Optical studies using UV–Vis diffuse reflectance spectroscopy (DRS) showed characteristic Mn<sup>2+</sup> absorption bands and a reduction in optical band gap from 3.77 to 1.00&#xa0;eV. A significant enhancement in third-order nonlinear susceptibility (χ³), from 0.009 to 0.473 × 10⁻<sup>10</sup> esu was observed with increasing MnO<sub>2</sub> content, along with increase in optical basicity (Λ(E<sub>g</sub>)) from 0.99 to 1.145. These results demonstrate that Mn incorporation induces substantial structural and electronic modifications, making the developed glass system a promising candidate for nonlinear photonic and optoelectronic device applications.</p>

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Structural and optical study in MnO2-modified lithium borate glasses

  • 期刊论文

  • 发表日期：

    2025年12月12日

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  • Priyanka Rani,
  • Komal Poria,
  • Sunil Dhankhar,
  • Rajesh Parmar,
  • R. S. Kundu

摘要

The melt-quench process was employed to fabricate (50-x)Li2O-xMnO2-50B2O3 glasses with varying MnO2 content (0 to 20 mol %). X-ray diffraction (XRD) confirms the amorphous nature of all glass samples. Electron Diffraction Spectra (EDS) confirms the presence of elements in the glass network. Structural analyses using Fourier-transform infrared (FTIR) and Raman spectroscopy revealed a gradual conversion of tetrahedral BO4 units into trigonal BO3 units with increasing MnO2 content, indicating that MnO2 acts as a network modifier. This modification enhances the concentration of non-bridging oxygen (NBO) sites, consistent with the observed decrease in glass transition temperature. Optical studies using UV–Vis diffuse reflectance spectroscopy (DRS) showed characteristic Mn2+ absorption bands and a reduction in optical band gap from 3.77 to 1.00 eV. A significant enhancement in third-order nonlinear susceptibility (χ³), from 0.009 to 0.473 × 10⁻10 esu was observed with increasing MnO2 content, along with increase in optical basicity (Λ(Eg)) from 0.99 to 1.145. These results demonstrate that Mn incorporation induces substantial structural and electronic modifications, making the developed glass system a promising candidate for nonlinear photonic and optoelectronic device applications.