Processing of transparent glass-ceramics by nanocrystallisation of LaF3
نویسنده
چکیده
ransparent glass-ceramics have been prepared by heat-treating oxyfluoride glasses in the Na2O–Al2O3–SiO2–LaF3 system. The nanocrystallisation f LaF3 was achieved by controlling time and temperature parameters. Glasses and glass-ceramics were characterised by dilatometry, DTA, XRD nd TEM. The mean crystal size (<20 nm) and the crystal fraction increase with the temperature of heat treatment, while they reach a maximum t 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 ncrease in the viscosity of the remaining glass matrix. Phase separation occurs in glass-ceramics depending on the glass composition which affects anocrystallisation. 2009 Elsevier Ltd. All rights reserved.
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