Abstract
The understanding of the kinetics of devitrification of a glass is important for anticipating its stability in a particular purpose, such as fiber-drawing processes. The crystallization kinetics of (BaF 2) 16(ZnF 2) 20(SrF 2) 20(NaF) 2(GaF 3) 5(InF 3) 36(GdF 3) 1 glass prepared by quenching were studied by differential scanning calorimetry (DSC). Avrami's exponent ( n) obtained by a non-isothermal method was 4.3 for a solid and 2.4 for a powdered sample. According to the classical interpretation of n, these magnitudes correspond to an interface-controlled crystal growth and a diffusion-controlled crystal growth, respectively. The activation energies for crystallization ( E) was 62±1 kJ/mol for solid glass and 245±2 kJ/mol for powdered glass. These results are discussed in terms of glass particle size.
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