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Further MN rule for thermally activated high field conduction in bulk samples of glassy Se100-xSbx alloys
(2009) N. Mehta; V.S. Kushwaha; A. Kumar
In the present paper, we report the observation of the Meyer-Neldel rule (MNR) in thermally activated high field conduction in bulk samples of glassy Se100-xSbx alloys. We have investigated Meyer-Neldel rule by two different approaches. In first approach, the temperature dependence of d.c. conductivity is studied at different electric fields without changing the composition of the glassy system. In the second approach, the composition itself varies at a particular electric field. We found that the conductivity obeys the Meyer-Neldel rule as the pre-exponential factor depends on activation energy. We also found a strong correlation between pre-factor σ00 and Meyer-Neldel energy in both cases. The observation of the correlation between pre-factor σ00 and Meyer-Neldel energy can be described by multiple excitations stimulated by phonon energy as described by Yelon and Movaghar. © 2009 Elsevier Ltd. All rights reserved.
On the glass transition phenomenon in Se-Te and Se-Ge based ternary chalcogenide glasses
(2009) N. Mehta; K. Singh; A. Kumar
The present paper reviews the results of non-isothermal differential scanning calorimetry (DSC) measurements on some ternary glassy systems of Se-Te and Se-Ge chalcogenide alloys for evaluation of activation of glass transition. The activation energy of glass transition (Eg) is calculated using Kissinger's relation, which is basically derived for amorphous to crystalline phase transition. The results show that Eg values obtained from Kissinger's relation are in good agreement with the Eg values which are obtained using Moynihan's relation based on the concept of thermal relaxation. This proves the applicability of Kissinger's relation for determination of activation energy of glass transition. © 2009 Elsevier B.V. All rights reserved.

2009

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