There is not electron transfer process in powder samples. It should be dissolved,dispersed ou attached to the surface of material such as glass carbon electrode and measure the impedance.
@waseem Abbas
It is not possible to do the electrical conductivity for powder samples....so take known amount of amount powder sample mixed with the polyvinyl alcohol acts as a binder make it as pellet with the pressure of 4ton and the obtained pellet surface pasted by silver in order make electrical contact...it is the better way to analyse the electrical properties of the prepared samples...
In some our previous work lectrical conductivity for powder materia were investigated using the method of impedance spectroscopy in the frequency range from 5 Hz to 500 kHz at the room temperature. Specimens were standard pressed pellets of a 13 mm diameter and thickness of about 1 mm and they were mounted in a variable air gap condenser with a micrometer screw and a spring to enable firm contact of the pressed pellet with golden disc electrodes. Specimen holder with the specimen was placed in the measurement chamber with 35 % RH. The specimen was left in this ambient about twenty days before the measurements started. Best regards, Svjetlana
We have used frequently the method of standard pressed pellets described here previously by othe researchers ....
I think compressed pellets of the powder or deposited over a non conductive substrate.
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