Objetivo Glasses are subject to inhomogeneities of various characteristics like composition or structure and of resulting properties like elastic modules or dielectric tensor. These inhomogeneities are partly correlated and extend over various range scales between only a few to a few thousand angstroms. The connection between characteristics and properties and the influence of the spatial size of characteristic on property is not well understood. A joint experimental investigation of inorganic glass-forming systems will be performed, aiming at questions of the spatial inhomogeneities of characteristics (micro-inhomogeneities). The aim of the project is to establish the spatial extent by combining various techniques (identification by ultrasound, optical and other scattering). The project will concentrate on silicate glass forming systems with Pb, Al or Ga modifiers. These glasses have a low concentration of non bridging oxygen, dominating covalent bonds, low glass transition temperatures (150-300 degrees C); high refractive index (1.7-2.1); high density (4-6g cm{-3}). It is expected that uinh are reflected in optical, acoustic, and other properties. Indeed unexpected piezoelectric and magneto-optic have been found in Ga- and Pb-glasses. They may be due to transitions between structurally soft configurations. The identification and characterization of uinh by comparing results from different experiments (light, sound, neutrons, X-rays) will therefore be carried out. Programa(s) IC-INTAS - International Association for the promotion of cooperation with scientists from the independent states of the former Soviet Union (INTAS), 1993- Tema(s) 15 - Condensed Matter Physics Convocatoria de propuestas Data not available Régimen de financiación Data not available Coordinador Freie Universität Berlin Aportación de la UE Sin datos Dirección Arnimallee 14 14195 Berlin Alemania Ver en el mapa Coste total Sin datos Participantes (4) Ordenar alfabéticamente Ordenar por aportación de la UE Ampliar todo Contraer todo S.I. Vavilov State Optical Institute Rusia Aportación de la UE Sin datos Dirección 193171 St. Petersburg Ver en el mapa Coste total Sin datos St. Petersburg State University Rusia Aportación de la UE Sin datos Dirección 198904 St. Petersburg Ver en el mapa Coste total Sin datos St. Petersburg Technological University of Plant Polymer Rusia Aportación de la UE Sin datos Dirección 198095 St. Petersburg Ver en el mapa Coste total Sin datos Université Claude Bernard Lyon 1 Francia Aportación de la UE Sin datos Dirección 69622 Villeurbanne Ver en el mapa Coste total Sin datos
