Help with graph units and interpretation

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SUMMARY

The discussion revolves around the interpretation of graphs generated by a Broadband Dielectric Spectrometer (BDS) in relation to capacitance and conductivity measurements. The user expresses confusion regarding the terms Re(C'), Re(C''), Re(σ'), and Im(σ''), particularly questioning the occurrence of negative capacitance in one graph and the identical units on both Y axes. The consensus indicates a likely labeling error in the graph creation process, necessitating a review of the graph's unit representation for accurate interpretation.

PREREQUISITES
  • Understanding of dielectric spectroscopy principles
  • Familiarity with capacitance and conductivity measurements
  • Knowledge of graph interpretation in scientific research
  • Experience with Broadband Dielectric Spectrometers (BDS)
NEXT STEPS
  • Review the user manual for the specific BDS model used
  • Research the mathematical definitions of Re(C'), Re(C''), Re(σ'), and Im(σ'')
  • Investigate common labeling conventions in scientific graphing
  • Explore case studies on dielectric measurements and their interpretations
USEFUL FOR

Researchers in materials science, physicists studying dielectric properties, and anyone involved in interpreting data from Broadband Dielectric Spectrometers.

thebluser
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Hello,

I have been doing research with a certain biological substance and its capacitance and conductivity. The following graphs are from a computer connected to a BDS (broadband dielectric spectrometer):
cpacitance 1.PNG

conuctivity 1.PNG


I understand the fundamental units, but Re(C'), Re(C''), Re(σ'), lm(σ'') do not make sense to me. How can capacitance be negative in one of the graphs? Why is there no difference between both axis in terms of fundamental units? Is it possible that the units are wrong? I have been looking at all the texts I have, but none of them are able to help.
 
Physics news on Phys.org
Looks like a labelling error in the graph creation. Notice that the two Y axes are the same units.
 

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