These are the parameters of finite length warburg-open circuit terminus,and according to my knowledge,

Wo-R is the value or Z'(real part of impedance) at very low frequency

Wo-T is the diffusion interpretation of wurberg element and it is given as Wo-T=L2/D where L is effective diffusion thickness and D is diffusion coefficient of particle.

Wo-P is an exponent part and its value is set at 0.5 for finite length warberg,,

If any body else has views about these parameters then kindly share it.

Thanks

First check if the angle between the line and the x-axis (real part of Z). if the angle is 45 degrees than it is indeed a Warburg element. If it is not, then you should use Constant Phase Element (CPE) instead to have a better modeling of your system as there are probably other mechanisms then only diffusion in the system. Usually there are softwares that fit your data to your proposed equivalent electrical circuit and calculate the parameters (charge transfer resistance, double layer capacitance, warburg diffusion, etc.). To have a rough calculation of the Warburg constant you can take 1 point from the line and use either the value of the real or the negative part of Z and the frequency value to calculate the constant.

Thank you very much for your guidance,I have calculated the values of different parameters using Zview software.I used CPE in equivalent circuit instead of a capacitor.I got 2 values for CPE,which are CPE-P and CPE-T.also three warburg values which are Ws-R,Ws-T,Ws-P.and values of Rs and Rct has also obtained.now what to do next step,I mean how to calculate the warburg constant.??

Thank you very much

Did you use the Finite Length Warburg - Short Circuit Terminus model? What are the values of Ws you have? The Ws should be fixed on 0.5 for Warburg element. In order to simplify things, I should recommend to use the CPE model instead of the Finite Length Warburg model with fixed value of n=0.5. That way you have the Semi-infinite Warburg model which is more generalized that the Finite model. The CPE-Q will give you the Warburg constant.

Sorry,by mistake,I wrote Ws,instead I used open circuit model.I got following values

Wo-R=0.032269

Wo-T=8.7251E-7

Wo-P=0.38

If I make value of Wo-p=0.5 then line becomes perpendicular and does not fit on my plot.

These are your constants (R, T, P) for the Warburg Finite Length Diffusion element. You can see the relevant equation of the element in the help file.

Thank you very much sir,u are very kind

Hi Mahreen Aslam ,

Can you send me The Zview software, it's very interesting. my mail is [email address deleted]

Cordialy

Hi Ahmad Bahloul

I sent it 2 times to your ID but may be your email ID is incorrect because every time i received failure notice.

Hi Mahreen Aslam,

thank you very much

my email

[email address deleted]

if it don't work you can use

[email address deleted]

cordialy

Hi, Ms. Aslam,

I am not quite sure the meaning of the three parameters you have in here:

Wo-R=0.032269

Wo-T=8.7251E-7

Wo-P=0.38

Could you make an interpretation， please？ Appreciate it!

These are the parameters of finite length warburg-open circuit terminus,and according to my knowledge,

Wo-R is the value or Z'(real part of impedance) at very low frequency

Wo-T is the diffusion interpretation of wurberg element and it is given as Wo-T=L2/D where L is effective diffusion thickness and D is diffusion coefficient of particle.

Wo-P is an exponent part and its value is set at 0.5 for finite length warberg,,

If any body else has views about these parameters then kindly share it.

Thanks

Can somebody please tell me how zview is used? And how data is imported in zview. In which format data is saved to import in zview?

Dear Devendra

Zwiew is use for presenting the results of Impedance measurement: Bode plot and Nyquist plot. As I know, the results measured from Zplot software in format *.z can open direct from Zview.

Actually, I did not clear about which kind of data you would like to import in Zview.

Regards

Anh

Thanks Nguyen for ur quick response. I take data from LCR meter which is saved in .txt format in four different column, first, temperature, second frequency, third impedance (absolute Z), and fourth theta. I just want to fit the data in semicircles. I can change the data manually to Z' and Z" if required. My basic aim is to fit the data in two semicircles ( I am getting two unresolved semicircles).

I have the data generated from the electrochemical station (CHI-660D) for the electrochemical impedance spectroscopy. Can anyone fit this data into Zsim and send me the model

I have read another document. This show that Wo-R is equal to Warburg coefficient, Wo-T = d/D^0.5, d - Nernst diffusion layer thickness. Please give me some suggestions!