Journal of Applied Sciences 1812-5654 1812-5662 Asian Network for Scientific Information 10.3923/jas.2007.3051.3056 Rosmawati S. Sidek H.A.A. Zainal A.T. Mohd Zobir H. 12 2007 7 20 A glass system based on TeO2-ZnO was successfully prepared. The optical properties were investigated using the technique of UV-FTIR spectra. The optical absorption was recorded at room temperature in the wavelength range of 200 to 800 nm while the FTIR spectra were recorded at room temperature in the wave number range 400 to 4000 cm. FTIR analyses reveal that the absorption band, associated with the Te-O-Te vibration mode has been observed near 669 cm-1. From the absorption edge studies, the value of the optical band gap Eopt and Urbach tail have been evaluated. The value of Eopt lies between 1.88 and 2.62 eV for the indirect transition and for direct transition the values vary from 2.46 to 3.01 eV whereas the Urbach energy values lies between 0.600 to 1.915 eV. The results indicated that the optical properties were observed to be dependent on the ZnO content.

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