Abstract
Some bismuth-borate oxide glass' samples were prepared by the fast quenching method, where B2O3 was replaced with equal concentrations of ZnO and CaO. X-ray diffraction (XRD) was used to examine the internal structure and Fourier transform infrared (FTIR) to identify building units and bonds throughout the studied structural matrices. XRD showed that all samples have short range order structural nature, while FTIR demonstrated some of Zn2+ acted as glass network formers and all Bi3+ acted as glass. UV-visible measurements and calculations showed a decreasing in the energy band gap from 3.83 eV to 1.73 eV with decreasing B2O3 content. Also with decreasing B2O3 content, both real refractive index and metallization factor decreased from 3.1 to 1.9 and from 0.56 to 0.71, respectively. For the studied glass' samples, density and molar volume showed inverted behaviors, where the density decreased while the molar volume increases with decreasing B2O3.
Highlights
Borate glass matrices are of the most used materials in many different fields, because they have the ability to accommodate many of different impurities, so they have a variety of properties depending on the nature of additives/impurities
Zinc borate glasses are very attractive materials, where zinc oxide is considered as n-type semiconductor has a broad optical band gap [3] so it has used to improve the glass properties to be useful for many various applications such as photo-voltaic cells, opt-electronic and gas sensors
Bi3+ cations occupied the interstitial vacancies as a glass network Modifiers (GNMs), while Zn+ cations participated in the glass networks as a glass network formers (GNFs)
Summary
Borate glass matrices are of the most used materials in many different fields, because they have the ability to accommodate many of different impurities, so they have a variety of properties depending on the nature of additives/impurities. Where ZnO was chosen to modify the optical and structural properties, while CaO was introduced to modify the structural properties, increase the amorphous nature, and help in the melt of both ZnO and Bi2O3 and force some of Zn2+ cations to share in the glass network as a glass network formers of tetrahedral coordination states. It should take into account, mostly, both ZnO and CaO act as glass network formers and occupied the interstitial vacancies. Both ZnO and CaO act to reduced BO4/(BO4:BO3) ratio and enhanced the glass' network by increasing
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