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<p>A series of Er<sub>2</sub>O<sub>3</sub> doped glass systems with compositions 33.35Na<sub>2</sub>O–66.65B<sub>2</sub>O<sub>3</sub>–(10 − x)Bi<sub>2</sub>O<sub>3</sub>–xEr<sub>2</sub>O<sub>3</sub> (x = 0–2&#xa0;mol%) were successfully prepared using the conventional melt-quenching method. The influence of Er<sub>2</sub>O<sub>3</sub> incorporation on the structural, optical, thermal, and physical characteristics of the glasses was systematically examined. Density and molar volume measurements revealed an initial increase in density up to 1&#xa0;mol% Er<sub>2</sub>O<sub>3</sub>, followed by a decrease at higher dopant concentrations, indicating composition dependent structural rearrangements within the glass network. Differential scanning calorimetry (DSC) revealed a gradual decrease in the glass transition temperature (T<sub>g</sub>) from 376&#xa0;°C to 363&#xa0;°C with Er<sub>2</sub>O<sub>3</sub> addition, indicating reduced network rigidity. FTIR analysis demonstrated the coexistence of [BO<sub>3</sub>] and [BO4]<sup>-</sup> structural units and confirmed that Er<sub>2</sub>O<sub>3</sub> acts as a network modifier by increasing the Non-Bridging Oxygen (NBO) content while reducing the contribution of [BiO<sub>6</sub>] units. Optical absorption studies exhibited characteristic Er<sup>3+</sup> intra-4f transitions in the visible and near-infrared regions, confirming the effective incorporation of Er<sup>3</sup>⁺ ions into the glass matrix. Both direct and indirect optical band gaps decreased systematically with increasing Er<sub>2</sub>O<sub>3</sub> content, attributed to the formation of localized Er<sup>3+</sup> energy states and enhanced structural disorder. The obtained results demonstrate that controlled Er<sub>2</sub>O<sub>3</sub> substitution effectively tailors the structural and functional characteristics of sodium-bismuth borate glasses, making them promising candidates for photonic and optoelectronic applications.</p>

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Structural, optical, thermal, and physical properties of Er2O3 Doped Na2O–B2O3–Bi2O3 glasses

  • 期刊论文

  • 发表日期：

    2026年7月21日

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  • K. R. Sardar Pasha,
  • V. C. Veeranna Gowda,
  • Harish Madival,
  • Reddy M. Sudhakara,
  • C. Narayana Reddy

摘要

A series of Er2O3 doped glass systems with compositions 33.35Na2O–66.65B2O3–(10 − x)Bi2O3–xEr2O3 (x = 0–2 mol%) were successfully prepared using the conventional melt-quenching method. The influence of Er2O3 incorporation on the structural, optical, thermal, and physical characteristics of the glasses was systematically examined. Density and molar volume measurements revealed an initial increase in density up to 1 mol% Er2O3, followed by a decrease at higher dopant concentrations, indicating composition dependent structural rearrangements within the glass network. Differential scanning calorimetry (DSC) revealed a gradual decrease in the glass transition temperature (Tg) from 376 °C to 363 °C with Er2O3 addition, indicating reduced network rigidity. FTIR analysis demonstrated the coexistence of [BO3] and [BO4]- structural units and confirmed that Er2O3 acts as a network modifier by increasing the Non-Bridging Oxygen (NBO) content while reducing the contribution of [BiO6] units. Optical absorption studies exhibited characteristic Er3+ intra-4f transitions in the visible and near-infrared regions, confirming the effective incorporation of Er3⁺ ions into the glass matrix. Both direct and indirect optical band gaps decreased systematically with increasing Er2O3 content, attributed to the formation of localized Er3+ energy states and enhanced structural disorder. The obtained results demonstrate that controlled Er2O3 substitution effectively tailors the structural and functional characteristics of sodium-bismuth borate glasses, making them promising candidates for photonic and optoelectronic applications.