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<p>In this study, lithium-doped glass nanocomposite systems with compositions xLi₂O-(0.30-x)TiO₂-0.35ZnO–0.35P₂O₅ (x = 0.10, 0.15, 0.20, and 0.25) have been synthesized using melt quenching technique. The XRD pattern is used to examine the amorphous nature of the samples. FESEM imaging confirms smooth amorphous morphology with embedded nanoparticles, supporting the partial crystallinity observed in XRD patterns. The DSC study demonstrates the improved thermal stability of the glass samples. The optical properties showed a reduction in optical bandgap (from 3.38–2.68&#xa0;eV) and an increase in the Urbach energy (from 0.36–0.48&#xa0;eV), indicating higher structural disorder. The refractive index as well as third-order susceptibility also increase with an increase in Li<sub>2</sub>O content. Dielectric and electrical studies demonstrate frequency-dependent dielectric relaxation behavior, analyzed using the Havriliak-Negami model. The dielectric constant exhibited a declining trend with frequency due to the inability of Li⁺ ions to realign with rapidly alternating fields. DC conductivity increases with Li₂O content, indicating enhanced ionic mobility. The relaxation activation energy decreases from 0.815&#xa0;eV to 0.372&#xa0;eV, confirming the weakening of the glass network's rigidity and the formation of additional conduction pathways. Impedance spectroscopy analysis shows reduced bulk resistance with increasing Li₂O content, validating improved charge carrier dynamics.&#xa0;The entropy analysis reveals an increasing trend with Li₂O content, signifying enhanced ionic mobility and structural modifications. Equivalent circuit modelling suggests a shift in charge transport mechanisms with increasing lithium concentration. These results demonstrate that the glass nanocomposite systems exhibit promising ionic-electronic conduction, making them viable candidates for energy storage applications.</p>

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Lithium-induced modifications in optical, thermal, dielectric, and charge transport behavior of TiO₂-ZnO-P₂O₅ glass nanocomposites

  • 期刊论文

  • 发表日期：

    2025年10月29日

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  • Ashes Rakshit,
  • Swagata Nandy,
  • Gagandeep Kaur,
  • Chakit Samanta,
  • Souvik Brahma Hota,
  • Rittwick Mondal,
  • Dipankar Biswas,
  • Debasish Roy

摘要

In this study, lithium-doped glass nanocomposite systems with compositions xLi₂O-(0.30-x)TiO₂-0.35ZnO–0.35P₂O₅ (x = 0.10, 0.15, 0.20, and 0.25) have been synthesized using melt quenching technique. The XRD pattern is used to examine the amorphous nature of the samples. FESEM imaging confirms smooth amorphous morphology with embedded nanoparticles, supporting the partial crystallinity observed in XRD patterns. The DSC study demonstrates the improved thermal stability of the glass samples. The optical properties showed a reduction in optical bandgap (from 3.38–2.68 eV) and an increase in the Urbach energy (from 0.36–0.48 eV), indicating higher structural disorder. The refractive index as well as third-order susceptibility also increase with an increase in Li2O content. Dielectric and electrical studies demonstrate frequency-dependent dielectric relaxation behavior, analyzed using the Havriliak-Negami model. The dielectric constant exhibited a declining trend with frequency due to the inability of Li⁺ ions to realign with rapidly alternating fields. DC conductivity increases with Li₂O content, indicating enhanced ionic mobility. The relaxation activation energy decreases from 0.815 eV to 0.372 eV, confirming the weakening of the glass network's rigidity and the formation of additional conduction pathways. Impedance spectroscopy analysis shows reduced bulk resistance with increasing Li₂O content, validating improved charge carrier dynamics. The entropy analysis reveals an increasing trend with Li₂O content, signifying enhanced ionic mobility and structural modifications. Equivalent circuit modelling suggests a shift in charge transport mechanisms with increasing lithium concentration. These results demonstrate that the glass nanocomposite systems exhibit promising ionic-electronic conduction, making them viable candidates for energy storage applications.