ZnO Modified Bismuth Silicate Glasses Structural and Physical Properties
Abstract
Zinc bismuth silicate glasses with compositions
40𝑆𝑖𝑂2 . 𝑥𝑍𝑛𝑂. 60 − 𝑥 𝐵𝑖2𝑂3 (𝑥 = 0,5,10,15,20,25,30,35, 𝑎𝑛𝑑 40) were prepared using standard melt-quench techniques and zinc solubility limits were estimated using X-ray diffraction techniques in the bismuth silicate glass scheme. Density was measured using the principle of Archimedes; the molar volume and density decreased with a rise in ZnO in the samples. The temperature of the glass transition (𝑇𝑔) was determined using differential calorimetry scanning (DSC) and is expected to raise with a rise in ZnO content. Raman and FTIR spectra were registered at room temperature and Raman and FTIR analysis demonstrates that in all glass compositions there are asymmetric and symmetric extended vibrations of Si-O bonds in 𝑆𝑖𝑂4 tetrahedral units and with reduction in Bi2O3, the input of symmetric vibrations starts to dominate resulting in enhanced compactness of the glass composition.
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Introduction
Heavy metal oxide-based glasses have drawn community attention for their outstanding IR transmission relative to standard glasses [1,2]. Bismuth oxide lenses are suitable for a broad spectrum of applications for optical and electronic instruments, mechanical sensors and window reflection [3,4]. Bi2O3 is not a classic glass former, but owing to elevated polarization and low field strength of 𝐵𝑖 3+ ions, a glass network of BiO3 and BiO6 may be constructed in the presence of standard glass formers such as SiO2, PbO and Bi2O3 [5]. The structural function Bi2O3 plays in glasses, however, is complex. Bi2O3 is appropriate for forming elevated refractive index, non-toxicity, broad range of transmission, and so on [6]. SiO2 has an incredibly broad range of industrial apps in its multiple amorphous forms [7]. Several reports are available in literature on ZnO- Bi2O3 with Bi2O3 and 𝑇𝑒𝑂2 , CdO-ZnO-𝑉2𝑂3 , 𝑉2𝑂3 - Bi2O3-B2O3 and 𝑉2𝑂5 -ZnO- Bi2O3 systems [8–14], but 𝑆𝑖𝑂2 - ZnO- Bi2O3 physical and structural trials are uncommon.
The objective of this document is to use XRD, DSC, FTIR, and Raman spectroscopy methods to explore the impact of ZnO on the physical and structural characteristics of bismuth silicate glass specimens.
Conclusion
Different studies such as X-ray diffraction, density and DSC conducted on 40𝑆𝑖𝑂2 . 𝑥𝑍𝑛𝑂. 60 − 𝑥 𝐵𝑖2𝑂3 for, (x=0,5,10,15,20,25,30,35,and 40) show that stable glasses are acquired for up to 40 glasses; the glass forming trend and thermal stability of these glasses increases with an rise in ZnO content. For higher concentration of ZnO that is, more than x=40, glass formation becomes difficult in the present physical conditions and this may be taken as the solubility limit of ZnO in present glass system. It is noted that the density of these glasses decreases with an rise in ZnO content. The input of symmetric vibrations of Si-O bonds in 𝑆𝑖𝑂4 tetrahedral units dominates asymmetric vibrations when ZnO is added to the bismuth silicate structure. 𝐵𝑖2𝑂3 plays both the former glass and the modifier role in the current study system.