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Processing of transparent glass-ceramics by nanocrystallisation of LaF3

✍ Scribed by N. Hémono; G. Pierre; F. Muñoz; A. de Pablos-Martín; M.J. Pascual; A. Durán

Book ID
104023125
Publisher
Elsevier Science
Year
2009
Tongue
English
Weight
613 KB
Volume
29
Category
Article
ISSN
0955-2219

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✦ Synopsis

Transparent glass-ceramics have been prepared by heat-treating oxyfluoride glasses in the Na 2 O-Al 2 O 3 -SiO 2 -LaF 3 system. The nanocrystallisation of LaF 3 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 T g . 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.

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