Abstract
The glass compositions 20BaO–xTiO2–(80–x)P2O5 with (x = 5, 10, and 20%mol) were elaborated by the conventional quenching method. These vitreous materials show a constant content of the barium oxide while the Ti/P ratio varies. They are characterized by X-ray diffraction in order to ascertain their amorphous nature. Density measurements are performed using diethyl orthophthalate as a medium liquid. It was found that their density and molar volume increases and reduces with TiO2 content, respectively. Raman spectroscopic analysis is employed to characterize their structural approach. This technique revealed the occurrence of various structural units of phosphate in the glass-matrix, primarily pyrophosphates, and metaphosphates. The optical absorption study of glasses confirmed the existence of Ti3+ ions in all the glassy samples, and it was found that the optical bandgap depends on the composition of the glass and reduces as the TiO2 content increases. Glass-ceramics relatives to the glasses were obtained by performing heat treatments of the glasses. The crystallized phases are identified using X-ray diffraction (XRD). It was found that a glass-ceramic containing a ferroelectric BaTiO3 phase is developed by transforming a glass composition (x = 20) to a crystalline phase. The electrical properties of the glass-ceramics are performed by impedance spectroscopy in the frequency range of 100 Hz to 1 MHz under various temperatures from 300 to 573 K. The glass-ceramic (GC) (x = 20) at room temperature has the highest dielectric constant εr = 51.6 and lower dielectric loss Tanδ = 0.005, and it was found that the glass-ceramics are mixed conductors with both ionic and electronic conductivities. The obtained results are discussed according to the chemical composition of these materials.
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The CNRST-Morocco and OCP foundation provided financial support in the framework of around phosphates project.
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Haily, E., Bih, L., El Bouari, A. et al. Structural, optical, and dielectric properties of the BaO–TiO2–P2O5 glasses. J Aust Ceram Soc 56, 1467–1479 (2020). https://doi.org/10.1007/s41779-020-00473-1
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DOI: https://doi.org/10.1007/s41779-020-00473-1