Characterization of oxyfluorotellurite glasses with TeO2–Li2O–ZnO–LiF composition
| Autor: | Andressa Novatski, Giulia de Souza Antero, Rafael Denkiewicz, Aloisi Somer, Anderson Gonçalves, Tasso O. Sales, Jaqueline V. Gunha, Carlos Jacinto, Robson Ferrari Muniz, Raouf El-Mallawany |
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| Rok vydání: | 2022 |
| Předmět: |
Materials science
Infrared Process Chemistry and Technology Analytical chemistry Surfaces Coatings and Films Electronic Optical and Magnetic Materials Amorphous solid symbols.namesake Molar volume Differential scanning calorimetry Materials Chemistry Ceramics and Composites symbols Thermal stability Fourier transform infrared spectroscopy Glass transition Raman spectroscopy |
| Zdroj: | Ceramics International. 48:4302-4311 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2021.10.224 |
| Popis: | Oxyfluorotellurite glasses in the form of 60TeO2–(15–x)Li2O–25ZnO–xLiF, 65TeO2–(15–x)Li2O–20ZnO–xLiF (with x = 0, 5, 10, and 15 in mol %), and 65TeO2(20–x)Li2O–15ZnO–xLiF (x = 0, 5, 10, 15, and 20 in mol %) have been synthesized. The amorphous state of the samples was assessed using X-ray diffraction (XRD). Density, molar volume, and oxygen packing density (OPD) were measured. The thermal properties were analyzed from room temperature to 873 K using a differential scanning calorimeter (DSC). The structural and optical properties were investigated using Fourier-transform infrared (FTIR), Raman, and ultraviolet–visible (UV–Vis) spectroscopies. The results demonstrated that the OPD values decreased with increasing LiF content, and this decrease can be attributed to a decrease in the total oxygen number. The structural characterization revealed that the addition of LiF reinforces the vitreous network causing the formation of F–Te–O bonds within a more connected network. In addition, increasing the LiF content improved the glass’s thermal properties, with a decrease in the glass transition temperature and an increase in thermal stability, which facilitates the glass manufacturing process. However, this feature is dependent on ZnO concentration. |
| Databáze: | OpenAIRE |
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