Dynamics of Disordered Materials
Proceedings of the ILL Workshop Grenoble, France, September 26–28, 1988
Paperback Engels 2012 9783642934216Samenvatting
This book contains the proceedings of a workshop held at the Institute Laue-Langevin in Grenoble in September 1988. Review articles and contributed papers survey recent theoretical and experimental developments on disordered materials and in particular on glasses. A large part of the book concerns the recently proposed mode-coupling approach to the behaviour of a viscous liquid around its glass transition, where the relevant dynamics extend over a broad range in time scales and the application of quite different experimental techniques becomes essential. Contributions report on experiments using dielectric relaxation, NMR or light scattering techniques, and especially neutron scattering techniques. One signature of disordered materials is the occurrence of an excess vibrational density of states at low frequencies. Some situations are presented where the density of states can be understood by taking into account the peculiarities of intra- and intermolecular motions. Another approach to the dynamics of disordered materials is the fracton picture, developed to describe the excitations of fractal objects. Several contributions discuss the dynamics of such fractals, studying mainly the vibrational density of states, and some discuss the application of the fracton concept to materials without a fractal structure like glasses.
Specificaties
Lezersrecensies
Inhoudsopgave
x
Br1?x.- Nature of the Glass Transition in (NaCN)1?x (KCN)
x.- Correlation Between Glass Behaviour and an Intrinsic Limit of Metastability: A Time Resolved Investigation.- The Effect of Orientational and Composition Disorder on the Low Temperature/Low Energy Rotational Excitations of the NH3 Groups in Calciumhexaamine Ca(NH3)6.- What Stabilizes the Orientational Glass Phase?.- Neutron Scattering Study of a Crystal with Random Competing Interactions.- Quasielastic Broadening of the Coherent Diffuse Scattering from the Orientational Glass (KBr)l?x(KCN)x.- V Fractal Dynamics.- Dynamics of Tenuous Structures.- Dynamics of Silica Networks.- Crossover in the Vibrational Density of States of Silica Aerogels.- Low Frequency Vibrations in Silica Aerogels.- Low Frequency Light Scattering in Lithium Borate Glasses; a Cross-Over from Phonons to Fractons?.- Index of Contributors.
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