| ZnCl2 Modified Physical and Optical Properties
of Barium Tellurite Glasses |
R. S. Kundu, Sunil Dhankhar, R. Punia*, Sarita Sharma and N. Kishore
pages 206-210
DOI : 10.1080/0371750X.2013/851883 |
| Abstract |
| The optical properties of tellurite based glass systems are composition dependent. For this purpose glass samples
of the composition 70TeO2-(30–x)BaO-xZnCl2 with x = 5, 10, 15, 20 and 25 have been synthesized by rapid melt
quenching technique. Glassy nature has been confirmed by X-ray diffraction pattern. The physical properties like
density, molar volume and crystalline volume have been estimated and found that density decreases while the
molar volume increases with increase in ZnCl2 content. The glass transition temperature decreases with increase
in halide content due to increase in the non-bridging oxygen contribution. Direct allowed optical transitions are
favourable in these glasses and the optical band gap energy (Eopt) has been observed to increase with increase in
ZnCl2 content. The value of Urbach energy of these glasses shows increasing behaviour with ZnCl2 concentration
indicating the breaking of weak bonds into defects. Metallization criterion for these materials shows that these
glasses may be potential candidates for non linear applications. |
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