Ahsan,
You want to measure powder conductivity. Such conductivity depends on the size of the powder particles and the contact between them resulting from their compression together. Since you have small quantity, then you have to use small cavities in in glass or ceramics in which you can compress your powder. Then you can use microprobes to access the compressed powder in the cavity . Knowing the dimensions of the compressed powder in the cavity and the resistance one can calculate the conductivity. If you do not have micro probes you can use two spots of silver epoxy on the side s of the cavity before you compress the powder.
Wish you success
Also, you might estimate, roughly, the conductivity "matched on" a different chunks' (grain) size level, by AC conductivity[1], exercising with a specific, but simple, a near "grain size probe". Between 2 (cylindrical, pistons) flat[4] surface electrodes, fix[1], only 3 (minimum), same size, credible grains[3], based on a virtual triangular (minimal) scheme. Then, press the pistons, and handle kindly, up to an estimate of an initial AC conductance, at the high(est), available, frequency f (Fmax~100kHz, or higher). So, a model based Z(f) might, roughly, estimate the conductivity, particular for each allotment (grains' size).
1. or even better by an EIS measurement.
2. You might interested to drop a grain on over a tiny amount of Ag or Carbon epoxy on the flat surface piston, only, on one (down side) electrode-piston.
3. An optical microscope will help. If available, use a polarized light in a metallurgical microscope, also.
4. How to Measure Flatness with Optical Flats http://www.gagesite.com/documents/Metrology Toolbox/How to Measure Flatness with Optical Flats.
Dear Nazir,
In order to measure the electrical conductivity of the prepared powders, the powders can be pressed into cylindrical pellets using a hydraulic press. With this method, you can obtain an insight into the electrical conductivity of the powders. Furthermore, this method is especially applicable for comparsion of the electrical conductivity of the prepared powder under different conditions. You can also see the below paper:
http://www.sciencedirect.com/science/article/pii/S0272884216000456.
With best regards.
Dear Claudia Rosa Santiago Ramírez,
this thread is about the electric conductivity of some dry powder samples, having different EC - quality, with a different physical meaning, a different context, without any Cdl, etc.
So, re-pose, please, another full alternative question, or even better, remake it as a NEW RG-question, concerning the exact case of your interest, your special cells, your own samples.
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