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- W3048290836 endingPage "123635" @default.
- W3048290836 startingPage "123635" @default.
- W3048290836 abstract "Bismuth borate glasses with (25 + x)Bi2O3–15BaO–10Li2O-(50 – x)B2O3 (where x = 0, 10, 20, 30 in mol%) compositions have been prepared by the standard melting technique, and characterized by X-ray diffraction (XRD), UV/Vis optical absorption (OA), thermal/dilatometric analysis, Fourier transform-infrared (FT-IR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). The XRD data confirmed the amorphous nature of the glasses in the 25–55 mol% Bi2O3 range, while the OA evaluation revealed a red shift in the glass absorption edge. A decrease in the optical band gap energies with increasing bismuth content was indicated by a Tauc plot assessment of the OA data. The thermal characterization showed that the coefficient of thermal expansion increased with bismuth oxide concentration, whereas the glass transition and softening temperatures decreased. However, these trends were not monotonic, but showed a tendency to plateau. The analyses by FT-IR and XPS (O 1s) pointed to structural rearrangements induced by the higher Bi2O3/B2O3 ratios, basically concurring with the evolution of BO3 units toward BO4 tetrahedra and the increase in non-bridging oxygens in the glasses. The evolution of the thermal properties was ultimately indicated to be linked with the structural changes." @default.
- W3048290836 created "2020-08-13" @default.
- W3048290836 creator A5034632184 @default.
- W3048290836 date "2020-11-01" @default.
- W3048290836 modified "2023-10-16" @default.
- W3048290836 title "Spectroscopic and dilatometric analysis of low-melting bismuth borate glasses in the Bi2O3–BaO–Li2O–B2O3 quaternary" @default.
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- W3048290836 doi "https://doi.org/10.1016/j.matchemphys.2020.123635" @default.
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