Generally for ferrite sample we use the dielectric data to find out the ac conductivity by the relation-σAC = e0erw tand. The ac conductivity can be also written as σ'= σDC + σAC, where σAC = A(T)ωn. It is reported that some researcher have calculated the value of n and A(T) from logσAC vs. f plot. Now what is the procedure to calculate the same from the said plot?
you can fit your ac conductivity data σAC = e0erw tand to the Jonshcers univerdsal dielectric response σ'= σDC + σAC. Take you ac conductivity data into origin software, and write the expression, and try do the fitting. The two fitting parameters A, and n will be obtained. In case you don't know how to do this, just ask someone knows using origin and can help you out for this simple fitting.
K. Sreenivas
I am also doing this fittling now a days so want to add something to this question.
do we need to fit a full range of frequency? in case i am getting different regions in it.?
is data near low freq (like from 10 Hz to 10k Hz) is sufficient for this fitting.?
and as a solution part- first plot conductivity Vs w(2*pi*f)
take log scale for both x and y.
then go to analysis - fitting - non linear fitting
then choose a user defned function and create new function.
put jonscher law in it. and then work on fitting
Recently I have found a video explaining the whole Jonscher fitting process in a very simple step by step manner... You can check it out
How to do Jonscher fitting - https://youtu.be/otNkigZZHM8
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