We tried with pellet, but its very difficult to make contacts, and the silver paste is diffusing to the sample.
Hi,
Please check the following links. You will get the idea.
http://www.chilworth.co.uk/instruments/process-safety-instruments/ctl28-powder-resistivity-test-apparatus.aspx
http://www.rsc.org/suppdata/cp/c1/c1cp21148j/c1cp21148j.pdf
These are routine measurements done in DSSC and supercapacitors. You can check some literatures regarding that as well for more idea.
All the best.
You can use four probe technique. No electroding with silver paste is needed. make pellelts and directly take measurements. Minimize the thickness as low as possible. preferably less than half of the probe spacing of the equipment
Strictly speaking, the concept of resistivity is only applicable to solid materials, but NOT to powdery materials as a whole. This is because the mass of powder in a given volume changes with the pressure applied to the powder sample, or depends on how dense the pellet of powder is.
However, for practical and comparison purposes, it is acceptable to measure the resistance of a specifically prepared body of powder sample, such as a pressed and sintered pellet with or without binding additives, or filling and pressing the powder into a cylindrical tube of insulator material and measuring the resistance from the two ends. Of course, one can use also the commercial equipment for measuring the resistance of powdery materials, such as that recommended by Aswin Gopakumar above. In such cases, the resistance can be normalised against the dimensions (e.g. volume) of the body of the powder, and the term of "apparent resistivity" should be used.
Volume Resistivity Test Cells for Liquids and Powders
https://www.electrotechsystems.com/products/electrostatic-instumentation/resistance-probes-clamps/volume-resistivity-test-cells-for-liquids-and-powders/
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