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

• Autor(a) principal: Giehl, J. M. [UNESP]
• Data de Publicação: 2011
• Outros Autores: Pontuschka, W. M. [UNESP], Barbosa, L. C., Blak, A. R. [UNESP], Navarro, M. [UNESP], Da Costa, Z. M.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1016/j.jnoncrysol.2010.12.025; http://hdl.handle.net/11449/194724
• topic: Tellurite glasses; TSDC; Gamma radiation

In order to have a better understanding of the role of the structure and the defects involved in the polarization processes in an 85TeO(2)-15Na(2)O mol% 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 340 K, preceded by a relatively weak positive peak at about 300 K. after different d.c. voltages of 1200, 1500 and 2000 V were applied. No response was obtained with 1000 V. but the peak intensity increased considerably for voltages above 1200 V. After gamma-irradiation of 25 and 50 KGy doses, a depolarization of the negative peak was observed in the sample submitted to 25 KGy, whereas for the sample irradiated with 50 KGy, six TSDC peaks appeared at regular intervals of 5 KGy, in the temperature range of 100 and 300 K. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.