Effect of Zn incorporation on the a.c. conductivity of glassy Se70Te30alloy
Authors:
- 6 December 2008
- journal article
- Published by EDP Sciences in The European Physical Journal Applied Physics
- Vol. 44 (3) , 217-221
Abstract
The present work reports the temperature and frequency dependence of a.c. conductivity in glassy Se70Te30−xZnx (x = 0, 2, 4 and 6) alloys in the temperature range 300–500 K and frequency range 1 kHz. An agreement between experimental and theoretical results suggests that the a.c. conductivity behaviour of the present samples can be successfully explained by correlated barrier hopping (CBH) model. The density of defect states has been determined using this model for all the glassy alloys. The results show that bipolaron hopping dominates over single-polaron hopping in this glassy system. This is explained in terms of lower values of the maximum barrier height for single-polaron hopping.Keywords
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