Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1475193 | Journal of the European Ceramic Society | 2009 | 6 Pages |
Abstract
Transparent glass-ceramics have been prepared by heat-treating oxyfluoride glasses in the Na2O–Al2O3–SiO2–LaF3 system. The nanocrystallisation of LaF3 was achieved by controlling time and temperature parameters. Glasses and glass-ceramics were characterised by dilatometry, DTA, XRD and TEM. The mean crystal size (<20 nm) and the crystal fraction increase with the temperature of heat treatment, while they reach a maximum at about 20 h at a temperature close to Tg. The crystallisation of phases containing glass modifier elements as well as F anions leads to the increase in the viscosity of the remaining glass matrix. Phase separation occurs in glass-ceramics depending on the glass composition which affects nanocrystallisation.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
N. Hémono, G. Pierre, F. Muñoz, A. de Pablos-Martín, M.J. Pascual, A. Durán,