Electrical Conductivity Measurement

 

•       Make an electrode (Powder) material pallet by taking 250mg of powder at 5 tonnes. But first, take 270mg pure Powder and add 5% PVP to prepare the powder.
•       After pressing put in the oven at 1250^oC for 4hr by wrapping in the pure powder. And then again repeat the same step by flipping the side of the pallet.
•       Make the device for testing.
•        Pallet size(diameter) is nearly 11mm after firing. Before firring it is 13mm.
•       Four probes (gold wires) must be mounted at a 2mm distance.
•       Then place the device by putting it on the shaft in the oven and set the temperature at 850^oC.
•       Then start the measurement for (850 => 150)^oC with step size of 30^oC.
•       Turning on the multimeter and applying the current as 5mA, 10mA, and 20mA. Then wait for 15 minutes and repeat the step. So, at each value of the current 2 measurements.
•       Note down the value of voltage against each current value.
•        If measurement takes more than 1 day, then the last measurement on day 1 and 1^st  measurement on day 2 must be taken at the same temperature, actually leaving the oven overnight at the same temperature to stabilize.
•       Conductivity graph must be plotted between 1000/T(K) x-axis vs log(conductivity*temperature(K)) y-axis.