Specific-heat measurements during cooling through the glass-transition region

Rajeswari, M. ; Raychaudhuri, A. K. (1993) Specific-heat measurements during cooling through the glass-transition region Physical Review B: Condensed Matter and Materials Physics, 47 (6). pp. 3036-3046. ISSN 0163-1829

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Official URL: http://prb.aps.org/abstract/PRB/v47/i6/p3036_1

Related URL: http://dx.doi.org/10.1103/PhysRevB.47.3036


In this paper we report the measurements of specific heats of five glass formers as they are cooled through the glass-transition region. The measurements are compared with other specific-heat measurements such as adiabatic-calorimetry and ac-calorimetry measurements. The data are then analyzed using a model of enthalpy relaxation and nonequilibrium cooling, which can track the nonequilibrium relaxation time τs. The relevant parameters that describe τs are obtained, allowing us to compare the enthalpy-relaxation times obtained from this method with other methods. We display the clear connection of the unrelaxed enthalpy with the nonequilibrium relaxation time and also show the role played by the delayed heat release from the unrelaxed enthalpy in the glass-transition region. We have also made certain definite observations regarding the equilibrium configurational specific heat and the Vogel-Fulcher law, which describes τs.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:42696
Deposited On:06 Jun 2011 07:14
Last Modified:06 Jun 2011 07:14

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