Abstract
Abstract On the basis of DTA analyses, three (1− x )TeO 2 – x LiCl ( x =0.3, 0.35 and 0.4 mol) glasses doped with 0.005 mol of Tm 2 O 3 were crystallized in the vicinity of 400°C. X-ray investigations for samples heated to 425°C (above the peak crystallization temperature) followed by quenching in air, revealed the presence of the paratellurite (TeO 2 ) as the only crystallizing phase in all glass compositions. SEM investigations revealed that the paratellurite crystals formed in these glasses as a result of surface crystallization were trigonal in shape, between 40 and 50 μm in length, 7 and 15 μm in width and 5 and 9 μm in depth. DTA analyses were carried out on the 0.7TeO 2 –0.3LiCl glass at different heating rates and an activation energy value of 238 kJ/mol for surface crystallization was determined graphically from a Kissinger-type plot using the analysis of Matusita and Sakka (Matusita, K. and Sakka, S., Kinetic study on crystallization of glass by differential thermal analysis — criterion on application of Kissinger plot. J. Non-cryst. Solids. 38&39 , 741–746.).
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