I have come across a publication (Jafarzadeh et al., 2014) where they have calculated bulk electrical conductivity of polymer film coated on metal from impedance modulus using the formula:
electrical conductivity = ((4L)/(pi x d^2 x R)) where L is the thickness and d is the diameter of the sample.
I am not very experienced in electrochemistry and as I have never seen this formula before and the authors unfortunately do not provide a reference, I just wanted to ask you if someone can confirm that this indeed is the way conductivity can be calculated?
thank you very much,
kind regards,
Karen
Electrical conductivity is the reciprocal of electrical resistivity, i.e.
Electrical conductivity = 1/electrical resistivity
For sample with,
diameter = d ,
thickness = L
electrical resistance = R
Electrical resistivity = (electrical resistance) (cross section area) / length
= (R) (d/2)2 Pi / (L)
where Pi = 22/7
Electrical conductivity = 1 / (R) (d/2)2 Pi / (L)
= 4(L) / (R) (d)2 Pi
Yes the formula is correct.
Best regards
Dear Karen,
Indeed, the calculation formula is no problem.
Best wishes
Lidong
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