Abstract
Five glass compositions were prepared by melt-quenching method with progressive substitution of ZnO for MnO2 in the glass system 70 TeO2-xZnO-(20 - x) MnO2-10 PbO (0 a parts per thousand currency sign x a parts per thousand currency sign 20 mol%). The FTIR spectra were recorded over a continuous spectral range 400-2,000 cm(-1) to study the structure changes with increasing of ZnO content. Differential thermal analysis was recorded to determine the glass transition temperature, T (g), and the crystallization temperature, T (P). The results indicated that the melting temperature, T (m), of these glasses under normal atmospheric conditions was found in the range of 1,030-1,090 K depending on the composition. The T (g) decreased while the T (m) increased with increasing ZnO content. The thermal parameters were correlated with the results of FTIR spectra. X-ray diffraction analysis showed that the as-prepared glasses have an amorphous nature while there are many crystalline phases such as Mn2Te3O8, Mn7O15Pb3, Pb3Mn7O15, Pb2Te3O8, Pb2ZnTeO6, and Zn2PbO4, which are formed after heat treatment.