Abstract
The kinetics of devitrification in ZrF4-BaF2-LaF3 (62–33–5 mol %) glass were studied by isothermal and nonisothermal methods using differential scanning calorimetry. The crystallization reaction followed the Avrami equation, x=1-exp[—(kt)], where x is the fraction crystallized after time t. The rate con stant k obeyed an Arrhenius equation, k(s−1)=6.69 × 1021 exp The value of the Avrami exponent, n, bas 3.2×0.2, indicating three-dimensional crystal growth at a constant number of nucleation sites. Values of kinetics parame ters obtained from isothermal and nonisothermal techniques were in excellent agreement. The heat of crystallization measured from isothermal peaks was computed to be 38.5×3.5 J/g.
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