I need to roughly estimate the electric conductivity of powder samples such as graphite and graphene. The problem is the sample quantities is so small and can not be compressed in pellets of desks.
To measure the conductivity of powder, you have to get rid of porosity and moisture. This can be done by compressing powder whatever small size you choose due to less amount of powder. If your resistivity is low (a few ohm cm), you can go to four probe technique. However, when it is high then two probe technique can be used.
To measure the conductivity of powder, you have to get rid of porosity and moisture. This can be done by compressing powder whatever small size you choose due to less amount of powder. If your resistivity is low (a few ohm cm), you can go to four probe technique. However, when it is high then two probe technique can be used.
This is a complex task, but you can find many details and warnings about the results in the attached file. If done properly, the experiments should allow you to deduce the intrinsic conductivity of the grains, but they are many things to take into account before it can be done. Good luck.
Alain
Dr. Amr
You can measure the conductivity by using two point or four point probe techniques according to the desired study, where two point probe is an easy method to study the resistance-temperature dependence while if you want study the IV characteristics use four point probe technique. With respect to the powder you must first get rid of the moisture and porosity of your mixture powder. Then compress it by high pressure compressor to get pellets. You can measure the conductivity, the resistivity or any other measurements between the two sides of the pellets
Thank you very much. I tried for copper sulphide powder.The 4 probe method succeeded. But for Zno, the powder is very fragile. which makes electrical contact wasted even with the silver lacquer. How can I do?
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