Hi Reddy,

You can make samples in solid form by compacting your powder in a die through the application of high pressures, and then use the obtained samples as the working electrode (WE) for your impedance measurements in three-electrode cell with a reference and auxiliary electrodes.

Please follow these steps...

1. First make pellet of your powder sample using a die and hydraulic press.

2. Sinter your pellet at optimized temperature .

3. Then apply silver paste both side of pallete and dry at 500 degree.

It will make sense to determine AC and DC resistances of the pellet. Additionally you should know the residual porosity