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Description of the Primary Relaxation in Supercooled Liquids Through the Timescale Steepness Function by Kokshenev, Valery B.; Borges, Pablo D.; Sullivan, Neil S. is a scholarly article available to read on EtoBox.

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The primary relaxation in glass forming supercooled liquids (SCLs) above the glass transformation temperature T_g is discussed in terms of the first-order (steepness) and the second-order (curvature) temperature derivatives of the observed primary relaxation timescale. We report new insights into the problem of the domain of the Vogel-Fulcher-Tamman (VFT) equation, raised by Stickel et al. (J. Chem. Phys.,1995, 1996) and discussed by Richert and Angell (ibid., 1998). A new ergodic-cluster Gaussian statistical approach to the problem is given based on Onsager's thermodynamic principle. The primary relaxation is described by the VFT equation below the crossover temperature T_c (known from mode coupling theory (MCT)), and above T_c by an extended (VFTE) equation obtained after accounting for cluster-size fluctuations. The timescale is parametrized by a finite number of observable parameters such as the steepness function m_T, the MCT slowing-down exponent gamma_c, and the VFT and VFTE strength indices D_g and D_c. The latter are defined at T_g and T_c, respectively, for the strongly and moderately SCL states, which show absolute thermodynamic instability at the same VFT temperature T_

Author

Kokshenev, Valery B.; Borges, Pablo D.; Sullivan, Neil S.

Published

2002

Language

EN