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Ceramist 2007;10(3):67-74.
Published online June 30, 2007.
An Investigation on the Crystal Growth Studies and Emission line shape in $Er^{3+}$-doped Sodium Tellurite Glasses
Purushottam Joshi, Animesh Jha
Formerly at the IMR, University of Leeds. Now at the Fibre Optics Laboratory, Raja Ramanna Centre for Advance Technology
Crystallisation kinetics of the erbium doped soda-tellurite glasses were studied using the differential thermal analysis (DTA) and differential scanning calorimetery (DSC) techniques. The DTA curves in the temperature range of 350 K to 650 K were obtained from isochronal heating rates, chosen in the range of 2 to 20 K/min. DSC isothermal curves were used to calculate the fraction of crystals formed on reheating. The apparent activation energies for devitrification were derived by measuring the shifts in the values of $T_g$ and $T_x$ with heating rates, using the Kissinger method. The derived values of apparent activation energies for isochronal and isothermal methods varied in the range of $190-204;{pm};5;kJ;mol^{-1}$. The X-ray powder diffraction analysis of heat treated and transparent samples showed the presence of nano-scale size sodium-tellurite crystals. These crystallites were found to have a strong influence on the full width of half maxima of the transition in $Er^{3+}:;^4I_{13/2}{ ightarrow}^4I_{15/2}$, which extended from 70 nm in the vitreous materials to 132 nm in glass-ceramic materials.
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