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Processing of transparent glass-ceramics by nanocrystallisation of LaF3

AuthorsHémono, Nicolas ; Pierre, G.; Muñoz, Francisco
KeywordsGrain size
Issue Date7-Feb-2011
AbstractTransparent 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.
Publisher version (URL)Journal of the European Ceramic Society 29 (2009) 2915–2920
Appears in Collections:(ICV) Artículos
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