Harikamalasree, * and Reddy, Sudhakara M and Viswanatha, R and Reddy, Narayana C (2016) Thermal and Fragility Studies on Microwave Synthesized K2O-B2O3-V2O5 Glasses. In: International Conference on Condensed Matter and Applied Physics (ICC), OCT 30-31, 2015, Bikaner, INDIA.
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Glasses with composition xK(2)O-60B(2)O(3)-(40-x) V2O5 (15 <= x <= 39 mol %) was prepared by an energy efficient microwave method. The heat capacity change (Delta C-p) at glass transition (T-g), width of glass transition (Delta T-g), heat capacities in the glassy (C-pg) and liquid (C-pl) state for the investigated glasses were extracted from Modulated Differential Scanning Calorimetry (MDSC) thermograms. The width of glass transition is less than 30 degrees C, indicating that these glasses belongs to fragile category. Fragility functions NBO]/((VmTg)-T-3) and (Delta C-p/C-pl)increases with increasing modifier oxide concentration. Increase in fragility is attributed to the increasing coordination of boron. Further, addition of K2O creates NBOs and the flow mechanism involves bond switching between BOs and NBOs. Physical properties exhibit compositional dependence and these properties increase with increasing K2O concentration. The observed variations are qualitatively analyzed.
| Item Type: | Conference Proceedings |
|---|---|
| Series.: | AIP Conference Proceedings |
| Publisher: | AMER INST PHYSICS |
| Additional Information: | Copy right for this article belongs to the AMER INST PHYSICS, 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA |
| Keywords: | Glass transition; coordination; Fragility; Modulated DSC |
| Department/Centre: | Division of Chemical Sciences > Solid State & Structural Chemistry Unit |
| Date Deposited: | 30 Jun 2016 04:30 |
| Last Modified: | 30 Jun 2016 04:30 |
| URI: | http://eprints.iisc.ac.in/id/eprint/54109 |
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