Abstract
Oxyfluorotellurite glasses in the composition 65TeO2–15Li2O-(20-x)ZnO-xZnF2 (x = 0, 5, 10 mol%) were prepared by melting quenching technique and their physical, thermal and structural properties were investigated. The results showed that the density and the oxygen packing density values decrease with increasing x. By the differential scanning calorimetry, the crystallization kinetic for each sample was evaluated and showed that activation energy decreases with increasing x, which can be related to the exchange of simple Te-O bonds for Te-F bonds. The variation on the quantity of these bonds were confirmed by FTIR and Raman spectroscopy. The mass attenuation coefficient values were found to reduce exponentially with increasing the energy. The radiation protection efficiency of glasses with 10 mm was 100, 50, and 30% for X-ray (40 KeV), 60Co (2.5MeV), and 137Cs energy lines (284 KeV & 66 KeV), respectively.
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