1Reaserch Scholar, Rayalaseema University, Kurnool, Andhra Pradesh, 518002, India
2Assistant Professor, Department of physics, SSA Govt First Grade College, Ballari, Andhra Pradesh, 515812, India
*Corresponding author: Boya Nagendra, Reaserch Scholar, Rayalaseema University, Kurnool, Andhra Pradesh, 518002, India. E-mail: nagendraboya@gmail.com
Online published on 18 December, 2018.
Sodium borotellurite glasses in the system xNaF2-(20-x) Na2O-40B2O3-40TeO2 (0 < x < 20 mol%) were prepared by melt quenching method. The density related parameters such as molar volume elastic constants and thermal properties were studied for present glasses with increasing NaF2 concentration. The results show that the calculated parameters strongly depend 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 elastic constants of the present glasses were found to decrease with NaF2 content. This results in an increase of the discontinuity of the glass network. 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.
Borotellurite Glasses, crystallization
