Physical and optical properties o of Sodium Borotellurite glasses

Boya Nagendra¹ , K. Narasimhulu²

Section:Research Paper, Product Type: Isroset-Journal
Vol.6 , Issue.5 , pp.105-110, Oct-2018

CrossRef-DOI:   https://doi.org/10.26438/ijsrpas/v6i5.105110

Online published on Oct 31, 2018

Copyright © Boya Nagendra, K. Narasimhulu . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
Sodium borotellurite glasses in the system xNaF2-(20-x)Na2O-40B2O3-40TeO2 ((0 < x < 20 mol%) were ready by melt quenching method. The density, molar volume and optical parameters were calculated for present glasses with increasing NaF2 concentration. The results shows that the calculated parameters strongly depends on increasing NaF2 concentration. The density reduction is due fluorine ions will enters interstitial spaces of the network and breaking B-O-Te bonds which results decreasing density of the present glasses. The thermodynamically parameters such as glass transition temperature and onset of crystallization temperature of the present glasses and were found to decrease as a function of NaF2 concentration. A shift of UV absorption edge to longer wavelength indicating reduction in the number of NBO’s with increasing fluorine concentration. When NaF2 introduced in glass network, fluorine ions break the network effects in a depolymerization, i.e. B-O-Te bonds are broken and non-bridging oxygen’s are made hence the decreasing band gap energy observed in the present glasses.

Key-Words / Index Term :
Glasses,Density,Optial absorption

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