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Structural relaxation due to sub-Tg annealing in Se-Te-Zn chalcogenide glasses

S. FAHEEM NAQVI1,* , N. S. SAXENA1

Affiliation

  1. Semi-conductor & Polymer Science Laboratory, 5-6, Vigyan Bhawan, University of Rajasthan, Jaipur- 302055, India.

Abstract

Structural relaxation during sub-Tg annealing of Se80-xTe20Znx (x = 2, 4, 6, 8 and 10) glassy alloys was investigated using differential scanning calorimetery (DSC). On annealing the glasses at a temperature of 333K, for different annealing times, the glass transition temperature increases and attains a constant value for higher annealing times. The recovery of excess enthalpy ∆Hexcess as obtained from the knowledge of excess specific heat ∆Cp, has been plotted as a function of annealing time ta. It is found that the excess enthalpy released ∆Hexcess increases with increase in annealing time (ta). The so obtained values of Tg and ∆Hexcess indicate that the relaxation process of Se80-xTe20Znx (x = 2, 4, 6, 8 and 10) glasses is almost completed and the glasses reach a stable equilibrium state..

Keywords

Differential scanning calorimetry (DSC), Annealing, Excess specific heat, Excess enthalpy.

Submitted at: Aug. 25, 2011
Accepted at: Oct. 20, 2011

Citation

S. FAHEEM NAQVI, N. S. SAXENA, Structural relaxation due to sub-Tg annealing in Se-Te-Zn chalcogenide glasses, Journal of Optoelectronics and Advanced Materials Vol. 13, Iss. 10, pp. 1313-1317 (2011)