2002/09/30 by U. Buchenau · 1 citation
Chemical Engineering · Engineering · Materials Science · Physics and Astronomy · #Material Dynamics and Properties #Phase Equilibria and Thermodynamics #Thermodynamic properties of mixtures #cond-mat.dis-nn
paper · pdf · doi:10.1088/0953-8984/15/11/319
published as J. Phys.: Condens. Matter 15, S955 (2003) · Contribution to the III Workshop on Nonequilibrium Phenomena in Supercooled Fluids, Glasses and Amorphous Materials, 22-27 September 2002, Pisa; 14 pages, 3 figures; Version 3 takes criticque at Pisa into account; final version 4 will be published in J.Phys.: Condens.Matter
arxiv created 2002/11/29 · openalex publication_date 2003/03/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
There is a growing belief that the mode coupling theory is the proper microscopic theory for the dynamics of the undercooled liquid above and around a critical temperature T c . In addition, there is some evidence that the system leaves the saddle points of the energy landscape to settle in the valleys at this critical temperature. Finally, there is a microscopic theory for the entropy well below T c (i.e. close to the calorimetric glass transition T g ), of Mézard and Parisi, which allows one to calculate the Kauzmann temperature from the atomic pair potentials. Description of the dynamics of the frozen glass phase is at present limited to phenomenological models. In the spirit of the energy landscape concept, one considers an ensemble of independent asymmetric double-well potentials with a wide distribution of barrier heights and asymmetries (the ADWP or Gilroy–Phillips model). The model gives an excellent description of the relaxation of glasses up to about T g /4. Above this temperature, the interaction between different relaxation centres begins to play a role. In a mean-field treatment, the interaction reduces the number of relaxation centres needed to bring the shear modulus down to zero by a factor of three.