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<p>Lead-free glasses that combine processability with efficient photon attenuation are needed for radiation-shielding applications. This study investigates melt-quenched 10SrO–10BaO–(80 − m)B₂O₃–mBi₂O₃ glasses with m = 0–40&#xa0;mol% to isolate the effect of Bi₂O₃ substitution on glass structure, thermal response, and gamma-ray attenuation. Melt-quenched samples remained predominantly amorphous by XRD, while FTIR showed progressive restructuring of the borate network, including an increased relative contribution from BO₄-associated environments at higher Bi₂O₃ contents. Bi₂O₃ strongly lowered the glass-transition temperature, from 545 to 376&#xa0;°C by DTA, and increased thermal expansion, with CTE<sub>20–300</sub> rising from 6.24 to 11.03 ppm/°C. Moderate Bi₂O₃ additions maintained good resistance to crystallization, whereas Bi₂O₃-rich glasses exhibited narrower stability windows and multistage devitrification. Density increased from 2.71 to 6.57&#xa0;g/cm³, accompanied by a rise in molar volume, indicating a heavier but more open network. Photon-shielding calculations showed major attenuation gains: at 0.662&#xa0;MeV, the tenth-value layer decreased from 11.26&#xa0;cm for the Bi₂O₃-free glass to 3.45&#xa0;cm for the glass containing 40&#xa0;mol% Bi₂O₃. Thus, Bi₂O₃ substantially improves gamma-ray shielding efficiency, although high Bi₂O₃ loading introduces thermal-stability and processing trade-offs.</p>

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Compositional Design of Bi₂O₃-Substituted Strontium–Barium Borate Glasses with Tunable Thermal Stability and Efficient Gamma-Ray Attenuation

  • 期刊论文

  • 发表日期：

    2026年7月29日

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  • Yurii Hordieiev

摘要

Lead-free glasses that combine processability with efficient photon attenuation are needed for radiation-shielding applications. This study investigates melt-quenched 10SrO–10BaO–(80 − m)B₂O₃–mBi₂O₃ glasses with m = 0–40 mol% to isolate the effect of Bi₂O₃ substitution on glass structure, thermal response, and gamma-ray attenuation. Melt-quenched samples remained predominantly amorphous by XRD, while FTIR showed progressive restructuring of the borate network, including an increased relative contribution from BO₄-associated environments at higher Bi₂O₃ contents. Bi₂O₃ strongly lowered the glass-transition temperature, from 545 to 376 °C by DTA, and increased thermal expansion, with CTE20–300 rising from 6.24 to 11.03 ppm/°C. Moderate Bi₂O₃ additions maintained good resistance to crystallization, whereas Bi₂O₃-rich glasses exhibited narrower stability windows and multistage devitrification. Density increased from 2.71 to 6.57 g/cm³, accompanied by a rise in molar volume, indicating a heavier but more open network. Photon-shielding calculations showed major attenuation gains: at 0.662 MeV, the tenth-value layer decreased from 11.26 cm for the Bi₂O₃-free glass to 3.45 cm for the glass containing 40 mol% Bi₂O₃. Thus, Bi₂O₃ substantially improves gamma-ray shielding efficiency, although high Bi₂O₃ loading introduces thermal-stability and processing trade-offs.