Abstract
The new semiconducting noncrystalline solid “tellurite glasses” of the form 0.7 TeO2–(0.3−x)V2O5–xAnOm have been prepared in bulk form with different compositions where AnOm is CeO2 or ZnO and x=0.03,0.05,0.07,0.10 mol %. Longitudinal ultrasonic attenuation in these glasses has been measured at frequencies of 2, 4, 6, and 8 MHz and in the temperature range of 100–300 K. The results showed the presence of a very well defined peak which shifts to higher temperature with increasing frequency, suggesting a kind of relaxation process. The acoustic activation energy, as well as the relaxation frequency, has been calculated and correlated with the relaxation strength for each composition. Correlations between the present low temperature of ultrasonic attenuation and the previous room temperature elastic moduli have been achieved for both glass series.
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