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<p>Borosilicate glasses with a base chemical composition of 45SiO<sub>2</sub>-27B<sub>2</sub>O<sub>3</sub>-12Na<sub>2</sub>O-11MgO-5Al<sub>2</sub>O<sub>3</sub>, and containing varying amounts of CoO, were prepared using the conventional melting and quenching method. X-ray diffraction confirmed the absence of distinct crystalline phases, while Fourier transform infrared spectroscopy highlighted key structural characteristics, including vibrational modes linked to Si–O–Si bonds and borate groups (BO<sub>4</sub> and BO<sub>3</sub>). The addition of CoO enhanced the thermal properties of the glass, indicating that performance can be optimized through careful control of oxide content. Optical studies revealed that the undoped glass had an ultraviolet (UV) absorption peak at 246&#xa0;nm, while CoO-doped samples showed visible absorption features at 515&#xa0;nm and 620&#xa0;nm due to specific electronic transitions. Increasing CoO concentrations decreased the optical bandgap and Urbach energies, with consistent refractive indices across samples. Changes in density and molar volume were associated with structural modifications from CoO additions, particularly a notable deviation at 0.4&#xa0;mol.% CoO, likely due to increased non-bridging oxygens. Additionally, CoO significantly improved various elastic moduli, emphasizing the influence of Co<sup>2+</sup> ions on the glass network structure.</p>

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Investigating CoO Doping in Sodium Magnesium Borosilicate Glasses: Impacts on Structural, Thermal, Optical, and Mechanical Properties

  • 期刊论文

  • 发表日期：

    2025年1月6日

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  • M. A. Marzouk,
  • R. M. Bahaa,
  • M. E. Hassaneen,
  • A. M. Othman

摘要

Borosilicate glasses with a base chemical composition of 45SiO2-27B2O3-12Na2O-11MgO-5Al2O3, and containing varying amounts of CoO, were prepared using the conventional melting and quenching method. X-ray diffraction confirmed the absence of distinct crystalline phases, while Fourier transform infrared spectroscopy highlighted key structural characteristics, including vibrational modes linked to Si–O–Si bonds and borate groups (BO4 and BO3). The addition of CoO enhanced the thermal properties of the glass, indicating that performance can be optimized through careful control of oxide content. Optical studies revealed that the undoped glass had an ultraviolet (UV) absorption peak at 246 nm, while CoO-doped samples showed visible absorption features at 515 nm and 620 nm due to specific electronic transitions. Increasing CoO concentrations decreased the optical bandgap and Urbach energies, with consistent refractive indices across samples. Changes in density and molar volume were associated with structural modifications from CoO additions, particularly a notable deviation at 0.4 mol.% CoO, likely due to increased non-bridging oxygens. Additionally, CoO significantly improved various elastic moduli, emphasizing the influence of Co2+ ions on the glass network structure.