Study of sodium tellurite glass using the thermally stimulated depolarization current technique (TSDC)

AbstractIn order to have a better understanding of the role of the structure and the defects involved in the polarization processes in an 85TeO2–15Na2Omol% glass, we used the thermally stimulated depolarization currents (TSDC technique). The TSDC of the non-irradiated sample presented a strong negative peak of current at the temperature of 340K, preceded by a relatively weak positive peak at about 300K, after different d.c. voltages of 1200, 1500 and 2000V were applied. No response was obtained with 1000V, but the peak intensity increased considerably for voltages above 1200V. After γ-irradiation of 25 and 50KGy doses, a depolarization of the negative peak was observed in the sample submitted to25KGy, whereas for the sample irradiated with 50KGy, six TSDC peaks appeared at regular intervals of 5KGy, in the temperature range of 100 and 300K.