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Bulletin of Pure and Applied Sciences- Physics (Started in 1982)
eISSN: 2320-3218
pISSN: 0970-6569
Impact Factor: 6.987 (2018)
DOI: 10.5958/2320-3218
Editor-in-Chief:  Prof. Madan jee,
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Article Details

Bulletin of Pure and Applied Sciences- Physics (Started in 1982)
Year : 2018, Volume & Issue : Volume-37D, Issue-2 (July-December)
Page No. : 126-136, Article Type : Original Aticle
Article DOI : 10.5958/2320-3218.2018.00018.0 (Received on 22.05.2018, Accepted on 12.11.2018)

Density and Mechanical Properties of Sodium Borotellurite Glasses

Boya Nagendra1*, Dr. K Narsimhulu2
Author’s Affiliation : 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:-[email protected]


Abstract

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. 

Keywords

Borotellurite Glasses, crystallization
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