Abstract
0.7125ZrF 4−0.2375(1 − xLaF 3 · xLnF 3)−0.05AlF 3 with x = 0.01, 0.02 and 0.03 for Ln Er and x = 0.03 for Ln Pr, Nd glasses were studied by differential thermal analysis (DTA). X-ray diffraction and optical spectroscopy. Avrami parameters ( E c and n) were obtained from DTA curves. With La 3+ substitution a decrease in the stability against crystallization was observed. This decrease follows the order Er 3+ > Nd 3+ ≈ Pr 3+ for 3% molar substitution. n values suggest an interface controlled growth mechanism with grain edge nucleation abler saturation. Two crystalline polymorphs of the LaZr 3F 15 phase were identified. With the substitution of 3 mol% of Pr 3+, Nd 3+ or Er 3+ for La 3+ only the crystallization of the rhombohedral α-LnZr 3F 15 phase was observed. An increase in Ω 6 Judd's intensity parameter occurs with crystallization and also an increase in the 1.04 μm peak emission cross-section for Nd 3+ 4 I 3 2 state suggesting the potential application of these glass ceramics in optical amplification devices.
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