In Alkali tellurite glasses, the glass forming tendency varies in terms of the material composition. In other words, compositions with a low content of the modifier (Alkali oxide) are more susceptible to form glass. In fact, the challenge here is about getting the cristalline phases corresponding to these compositions which are more susceptible to form a glass.
So, can you help me to find a way to prevent the glass forming of TeO2 rich compositions and to promote their crystallization.
Dear Reda
Some hints in order to promote nucleation and growth:
1) Decrease your cooling rate from the melt. If there are some nuclei, crystal size is U.t (U:crystal growth rate and t: time). U is intrinsec of the material then the variable that you can modify is time at each temperature (cooling rate).
2) Prepare the glass, then grind it to increase its specific surface.In many systems, crystals like to grow from the surface. Them heat the powder above Tg but below a possible melting temperature.
3) If 1 and 2 did not work , perhaps you have to use a nucleating agent.
Goog luck!
Thank you so much Dr Prado for your detailed answer and helpuful hints !
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