Transparent Nano Crystalline Glass‐Ceramics by Interface Controlled Crystallization. (1st June 2013)

• Record Type: Journal Article
• Authors: Bocker, Christian; Rüssel, Christian; Avramov, Isak
• Is Part Of: International journal of applied glass science. Volume 4:Number 3(2013:Sep.)
• Page Start: 174
• Page End: 181
• Publication Date: 2013-06-01
• Subjects: Glass -- Periodicals; Glass manufacture -- Periodicals; 666.1
• DOI: 10.1111/ijag.12033
• Languages: English
• ISSNs: 2041-1286

Abstract

Abstract : A prerequisite for the preparation of nano glass‐ceramics is an increase in viscosity of the residual glassy matrix phase during the course of the crystallization process. This results in a deceleration of the crystal growth process due to increasing stresses, which finally may lead to a total freezing of the crystallization process. In principle, two routes for the preparation of nano glass‐ceramics exist: in one of these routes, the first step is a phase separation in which a droplet phase is formed. Inside this droplet phase, the crystals are precipitated. In the other route, a preceding phase separation does not occur and the nucleation takes place in a homogeneous glassy phase. In both cases, the crystal growth velocity is high until the crystals reach a size of some nanometers or some ten nanometers, then the crystal growth velocity decreases strongly.