As i was new to this field. I want to know about Tg.Is Tg different for TeO2,Sillica and Chalcogenide glasses?
Dear Vani,
The precursors which you are using and want to know the glass transition temperature, may have different temperature as when you add these precursors in some host matrix or glasses with other compounds, then the temperature will vary accordingly. I think DSC may help you to find the transition temperature of your glasses.
Best Regards
offcourse each material have different Tg (I mean only vitreous materials) and chalcogenide glasses is a large family of glass as like oxide glasses, it have very wide range of Tg, depend upon composition of the glass. If you have only Se, the Tg of Se ~ 30 C and if you took GeSe2 the Tg is ~300C. I hope this will help your question.
Your question is too vague to answer. Every glass has its own, unique Tg. That of vitreous silica is over 1000C, while chalcoginides can be less than 100C. There are glasses with Tg below 0C. Tg is the temperature where the relaxation time for structural relaxation is of the order of the experimental time, i.e. it varies with the experimental method used to make the measurement. For example, using a DSC with identical sized samples with result in a higher Tg for the same glass when a faster heating rate is used. The details of the experiment must be clearly stated when reporting values of Tg. Tg of most inorganic glasses are measured either using a dilatometer with a heating rate of 4K/min or a DSC with a heating rate of either 10 or 20 K/min. There is no standard test. Impurities can strongly affect Tg of some glasses, e.g. vitreous silica will have Tgs varying by over 100K for different hydroxyl contents. Tg of vitreous germania can change by at least 50 K due to changes in sodium impurity contents of a few ppm.
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