Electrode effects revisited [permittivity measurement]

Electrode effects are often observed as an instrumental artifact associated with measurements of electrical permittivity at low frequencies. Such effects introduce a polarization capacity, C_p , associated with the interface between the electrode and the material under test. This polarization capacity follows a fractional power law dependence on frequency, such that C_p ∝ ω^-α, where ω is the frequency and α is a function of frequency with values below 1/2. The possibility that such a power law dependence may be attributed to coupling between the applied electric field and the free charge in the Debye layer is examined