How do you imagine to get the answer without providing information on the chemistry of the substance and the intended result? Only telepathist would probably help. In general, trial TGA experiment will give an estimate. Or look for papers on this material.

I agree with Evgeny. TGA could be helpful to estimate your materials, but depend on what your materials and intention.

by TGA can tell you about weight of sample not about reaction. you need to get DSC or (if you do not have DSC) DTA. by this information you can easily understand time and temperature of reaction (such as calcination)

Agreed, DSC is better. My thought was that TGA is (usually) more easily available and still can provide a rough estimation (if the reaction is not a kind of isomerisation; however, this is rarely the case of calcination).

well thank u all for the answers .. my material is SnO2 nano powder... intend to calcine it for doing XRD..

Temperature may be actually any up to about +700-800 deg C. This will largely influence the observation and properties. Please check the following publication for a starting point - http://link.springer.com/article/10.1007%2Fs11595-010-0122-z You will find much more examples if you just google "SnO2 calcination"

Anneal it in 5 different temperatures and then check your samples on XRD, if you do not have DSC. Do you already know how long you will do annealing? It is also important parameter... May be it is possible to use lower temperature by taking longer heat treatment.

It depends on your synthesis procedure. What templates you used while preparing the material. You can easily find the calcination temperature by estimating decomposition temperatures of organic materials used in the synthesis by TGA or DSC.

Hi Sandip! Normally, as Evgeny suggested, I try a TGA/DSC first to know in what range of temperature your starting materials will decompose and react together. Then, based on the TGA/DSC results, I try to anneal the powder at different temperatures, like Andris' suggestion. Finally, I optimize the calcination by varying the annealing time and checking with XRD.