How to choose crucibles in TGA experiments?
Alumina Crucible (Ceramic Crucible) is the most commonly used crucible in TGA experiments. It is relatively stable for most samples and doesn’t react with the samples. In the range of room temperature to 1650°C, the alumina crucible has no thermal reaction.
The melting point of the aluminum oxide crucible exceeds 1700℃, which can be used repeatedly.
During the TGA test, the crucible must be open. But before the actual test, it is also very important to seal the crucible, because this can prevent the sample from contacting the air before the test and prevent the moisture in the sample from evaporating before the test. The crucible can be drilled before the experiment, and this process can be done well on the autosampler during the experiment.
Under normal circumstances, the crucible used in the TGA experiment is 70uL alumina crucible, but sometimes other special crucibles are also required for thermogravimetric experiments. If you want a colleague in the thermogravimetric test to obtain a better synchronized DSC curve, you can use a 40uL aluminum crucible with a temperature below 600 degrees Celsius. If the sample has very few volatile components or is very uneven, use as many samples as possible in this case. At this time, use a larger crucible, such as 150uL alumina crucible or 900uL alumina crucible.
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