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<p>This study explores the impact of Bismuth (Bi<sub>2</sub>O<sub>3</sub>) incorporation on the thermal, mechanical, and dielectric properties of xBi<sub>2</sub>O<sub>3</sub>-(0.4-x) BaO-0.3P<sub>2</sub>O<sub>5</sub>-0.3V<sub>2</sub>O<sub>5</sub> glass systems (x = 0.05, 0.15, 0.25, and 0.35), prepared through the melt-quenching technique. Thermal stability was evaluated using differential scanning calorimetry (DSC), where key parameters such as the glass transition temperature (<i>T</i><sub><i>g</i></sub>), crystallization temperature (<i>T</i><sub><i>c</i></sub>), and peak crystallization temperature (<i>T</i><sub><i>p</i></sub>) were analysed. Results show that the addition of Bi<sub>2</sub>O<sub>3</sub> improves the thermal stability of the glass samples, with a 34% increase observed at 35&#xa0;mol% Bi<sub>2</sub>O<sub>3</sub>. The mechanical properties, including shear modulus (S) (increasing from 13.48 to 14.03 GPa), longitudinal modulus (L) (from 41.00 to 42.55 GPa), bulk modulus (K) (from 23.08 to 24.01 GPa), Young’s modulus (Y) (from 33.75 to 35.18 GPa), and Poisson’s ratio (Pr) (decreasing from 0.257 to 0.253), were derived from ultrasonic velocity measurements. An increase in elastic moduli with Bi<sub>2</sub>O<sub>3</sub> addition indicates enhanced elastic properties due to structural modifications within the glass network. The dielectric strength was determined at varied temperatures and frequencies, and the dielectric constant and dielectric loss decreased with increasing frequency while both increased with increasing temperature. The calculated electric modulus also shows scaling behaviour with the scaling exponent independent of composition and temperature. Continuing the analysis by employing Bergman’s function, it was revealed that the observed dielectric response has a non-Debye type relaxation and suggested that the structural reorganisation plays a role in the change in the observed relaxation mechanism of the heavy metal and alkaline earth oxides-doped vanadium-phosphate matrix. The simultaneous enhancement of thermal, mechanical, and dielectric properties highlights the potential of these thermally stable glasses for the deployment in energy storage applications, such as solid-state batteries.</p>

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Effect of Bi2O3 addition on the mechanical and dielectric properties of Bi2O3-BaO-P2O5-V2O5 glasses with improved thermal stability

  • 期刊论文

  • 发表日期：

    2025年7月16日

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  • Souvik Brahma Hota,
  • Swagata Nandy,
  • Kaushik Das,
  • Dipankar Biswas,
  • Vikas Mittal,
  • Debabrata Pramanik,
  • Rittwick Mondal,
  • Debasish Roy

摘要

This study explores the impact of Bismuth (Bi2O3) incorporation on the thermal, mechanical, and dielectric properties of xBi2O3-(0.4-x) BaO-0.3P2O5-0.3V2O5 glass systems (x = 0.05, 0.15, 0.25, and 0.35), prepared through the melt-quenching technique. Thermal stability was evaluated using differential scanning calorimetry (DSC), where key parameters such as the glass transition temperature (Tg), crystallization temperature (Tc), and peak crystallization temperature (Tp) were analysed. Results show that the addition of Bi2O3 improves the thermal stability of the glass samples, with a 34% increase observed at 35 mol% Bi2O3. The mechanical properties, including shear modulus (S) (increasing from 13.48 to 14.03 GPa), longitudinal modulus (L) (from 41.00 to 42.55 GPa), bulk modulus (K) (from 23.08 to 24.01 GPa), Young’s modulus (Y) (from 33.75 to 35.18 GPa), and Poisson’s ratio (Pr) (decreasing from 0.257 to 0.253), were derived from ultrasonic velocity measurements. An increase in elastic moduli with Bi2O3 addition indicates enhanced elastic properties due to structural modifications within the glass network. The dielectric strength was determined at varied temperatures and frequencies, and the dielectric constant and dielectric loss decreased with increasing frequency while both increased with increasing temperature. The calculated electric modulus also shows scaling behaviour with the scaling exponent independent of composition and temperature. Continuing the analysis by employing Bergman’s function, it was revealed that the observed dielectric response has a non-Debye type relaxation and suggested that the structural reorganisation plays a role in the change in the observed relaxation mechanism of the heavy metal and alkaline earth oxides-doped vanadium-phosphate matrix. The simultaneous enhancement of thermal, mechanical, and dielectric properties highlights the potential of these thermally stable glasses for the deployment in energy storage applications, such as solid-state batteries.