Impact of barium oxide on the structural, thermal, and chemical properties of bismuth borate glasses for optical and thermal applications

Saber, I. and Talbi, A. and Dahmani, K. and Kharbouch, O. and Baach, B. and Hsissou, R. and Galai, M. and Belfaquir, M. and Almeer, R. and Al-Maswari, B. M. and Guedira, T. and El Youbi, M. S. (2025) Impact of barium oxide on the structural, thermal, and chemical properties of bismuth borate glasses for optical and thermal applications. Ceramics International, 51 (6). pp. 7775-7789. ISSN 0272-8842

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Abstract

This study examines the impact of barium oxide on the physical, chemical, and thermal properties of bismuth borate glasses with the composition (BaO)x.(Bi2O3⋅3B2O3)(1-x), where x = 0, 0.2, 0.4, 0.6, and 0.8 mol%. Physical parameters, including density (ρ), molar volume (Vm), oxygen packing density (OPD), and molar oxygen pro- portion (VO), were evaluated as a function of the BaO content. The results indicate that increasing BaO con- centration leads to higher density and lower molar volume, suggesting the formation of a more compact oxide network with the incorporation of non-bridging oxygen atoms. The oxygen packing density (OPD) initially in- creases (8.786 g.atm/L at x = 0.2) before decreasing, while the molar volume peaks at x = 0.4, which can be attributed to the transition from BO3 to BO4 units. X-ray diffraction (XRD) analysis confirmed that all glass samples were amorphous. Thermal analysis revealed that the glass transition temperature (Tg) and crystallization temperature (Tc) increased with the addition of BaO. Fourier transform infrared (FTIR) and Raman spectroscopy identified characteristic absorption bands associated with [BO3], [BO4], [BiO3], and [BiO6] units, highlighting the depolymerization of the glass network. Optical absorption studies indicate a decrease in band gap energy from 2.85 to 2.61 eV for direct transitions and 2.59 to 2.03 eV for indirect transitions with increasing BaO content. This implies the formation of unbridged oxygen atoms, a conclusion that is supported by the physical and structural results. XPS results show the coexistence of Bi3+ and Bi5+, linked to the reduction of oxygen bridging bonds. SEM and EDS analyses revealed increased granular features and non-uniformity with rising BaO content. This comprehensive characterization highlights that barium oxide (BaO) significantly impacts the structural, thermal, and chemical properties of bismuth borate glasses, thereby enhancing their potential ap- plications in optical devices.

Item Type:	Article
Uncontrolled Keywords:	SHIELDING PROPERTIES, BI2O3, IONS, XPS, BEHAVIOR, SPECTRA, ZNO, BAO
Subjects:	C Chemical Science > Chemistry
Divisions:	Department of > Chemistry
Depositing User:	Ms Varalakshmi
Date Deposited:	27 Oct 2025 06:35
Last Modified:	27 Oct 2025 06:35
URI:	http://eprints.uni-mysore.ac.in/id/eprint/17869

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