Different approaches on capacitance measurements for Relative permittivity (Dielectric Constant εr)
14-05-2019 13:59 (Chennai, India)

Five techniques are compared in the Autolab Application Note EC12 to acquire the compatibility of each methods for capacitance measurements.

The relative permittivity εr, also known as dielectric constant, is of great importance in materials characterization. It can be defined as the ratio between the amount of electrical energy stored in a material and the amount of electrical energy stored in the vacuum (hence the term relative). It is a frequency dependent quantity but, at low frequencies, εr becomes constant and is referred as the static relative permittivity.

In this Autolab Application Note EC12, five techniques are compared. Three techniques are based on potential sweep, i.e., staircase sweep, linear sweep and current integration. The other two techniques are chrono amperometry and electrochemical impedance spectroscopy (EIS).

All the measurements are carried out with the Autolab PGSTAT204, fitted with the FRA32M impedance analyzer and the onboard current integrator, except for the linear scan measurements, which is carried out with a PGSTAT302N fitted with the SCAN250 module.

For the full descriptions of the experiment, please click here