ArticleAuthors: Nguyen, Nang Dinh; Nguyen, Thi Bao Ngoc (2006)
Impedance spectroscopy (IS) technique has been analyzed and
applied to measure the ionic conductivity of the films. For a superionic
conductor, like a thin-film electrolyte, it is necessary to characterize IS by using
a two-electrodes ccll, where the thin film is deposited between two metallic
electrodes. In a very thin film, the Helmholtz layer strongly affects to the
conductivity during the measurement. So that, an equivalent scheme should be
chosen with a separation of three frequency zones to fit the theoretical curves to
experimental data. The best curve fitted with two to three circles is taken and
elaborated to determine all the parameters of the scheme, and R4 — a para... 
