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Transparent Nano Crystalline Glass‐Ceramics by Interface Controlled Crystallization
Author(s) -
Bocker Christian,
Rüssel Christian,
Avramov Isak
Publication year - 2013
Publication title -
international journal of applied glass science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 34
eISSN - 2041-1294
pISSN - 2041-1286
DOI - 10.1111/ijag.12033
Subject(s) - crystallization , materials science , nucleation , phase (matter) , nanometre , crystal (programming language) , crystal growth , ceramic , nano , chemical engineering , viscosity , composite material , chemical physics , crystallography , thermodynamics , chemistry , physics , organic chemistry , computer science , engineering , programming language
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.