Equivalent circuit models using CPE for impedance spectroscopy of electronic ceramics

ABSTRACT

Complex immittance (Impedance Z, Modulus M, Admittance Y, Permittivity ϵ) spectra for some equivalent circuit models involving resistances, capacitances and constant phase angle elements (CPE) are calculated for different ratios of the parameters. A comparison of experimentally obtained complex immittance plots with these diagrams greatly facilitates the search for the most appropriate equivalent circuit representing the electrical properties of electronic ceramics. An equivalent circuit for Ba_1-xSr_xTiO₃ (x = 0.35) ceramic system is developed by using these simulated plots.

KEYWORDS:

• Impedance spectroscopy
• ceramic
• constant phase angle elements (CPE)
• equivalent circuit model
• CNLS

Funding

The financial support received by one of the authors (SP) from IIT(BHU) in the form of Teaching Assistantship is gratefully acknowledged.