Hello,
My question is on the ac impedance measurement of composite polymeric films. From each measurement, I generally calculate the bulk resistance.The problem which I encountered is that when I measured the same sample at two different frequency range (viz., 100mHz - 7MHz and 100mHz - 5MHz), it gave me two different results. I am totally confused to consider the correct one. The conductivity of the films is in the range of 10-7 to 10-4 Scm-1.
So my concern is that which frequency range I should use for the measurement. or which is the preferred frequency range for such type of measurement ?
If anybody could clarify the problem, it would be of great help for me.
Thank you.