Recent content by sunwoo lee

I am studying on Fe powder samples. I have used I-V measurement system to get resistivty. However, I would like to measure with 4-point probe. but I am confused how to prepare the powder sample for 4-point probe. could you tell me there is a way?

recently, I did a experiment about insulating coating on a powder. and I measured resistance with various voltage. according to Ohm's law, the resistance is constant however, my sample showed different resistance with difference V. At every voltage, I checked the currents and the resistance...