I have this new IVIUM Technologies Electrochemical Spectrometer and I´m trying to collect EIS data of a symmetrical ceramic cell from RT to 800 °C but all I get above 1 Hz is unreasonable impedance values (negative Z' and/or Z'' 2 o 3 orders of magnitude larger than the expected signal that should be a few ohms).
Hello Leopoldo,
Did you ran Krammers-Kroning test to see if there's a problem on your results? Or problems with cable insulation, grounded Faraday cage, etc? Or maybe high temperatures can break the steady state of your system?
Othon,
Thanks for your comments, I have not made any test. The data looks impossible to analyze. Data collection is performed in a Probostat system with a brand-new instrument so I am assuming the environment and connections area fine. I´m afraid my sample is bad or the instrument has some wrong setting... a measurments on a RC circuit made of known elements gave a good result.
I will check other options but keep your suggestions in mind.
Thanks again.
Dear Leopoldo Suescun,
let us propose to remake, please, your EIS spectrum, at least, after vacuum drying your cell[1,2], overnight. This simple step (of the vacuum drying) is in order to reduce the (relative) humidity. Humidity could be responsible for issues about "noise", as well as, some unreliable impedance values.
An additional step could be to prepare an (EIS measurement) fixture setup under vacuum, if possible, to repair failed EIS (and noise) issues, further.
1. Do you have 2-electrodes or 4-electrodes ?
2. Also, can you minimize the distance of your electrodes or the thickness of your sample ?
If you can identify the noise you can filter it out, but run the risk of losing part of the signal if the identification Is not exact.
Thank you Ioannis Samaras and Jerry Decker for your suggestions.
My runs are at high temperature, therefore humidity should not be a problem. I´m blowing air on the sample, though, so maybe I should check...
Noise seems to be related to some instability of the signal, because if I increase the excitation voltage amplitude I get cleaner spectra, but at lower voltages noise shows up. The problem with higher excitation voltages is that I get different spectra if I increase the voltage too much, probably due to 2nd order phenomena...
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