Application of AC Impedance Spectroscopy for Characterization of BiNbO4 Ceramics

2012 ◽  
Vol 512-515 ◽  
pp. 1193-1197 ◽  
Author(s):  
Agata Lisińska-Czekaj ◽  
Beata Wodecka-Duś ◽  
Dionizy Czekaj
Keyword(s):  
Impedance Spectroscopy ◽  
Least Squares Method ◽  
Complex Impedance ◽  
Impedance Measurement ◽  
Simulated Data ◽  
Electrode Processes ◽  
Usual Representation ◽  
Ac Response ◽  
Input Perturbation

Impedance spectroscopy is known as an important technique used for describing the electrical processes occurring in a system on applying an ac signal as input perturbation. In the present paper results of a study of BiNbO4 ceramics fabricated by mixed oxide method and sintered by free sintering are reported. Results on the ac response of the electroceramic samples by impedance spectroscopy at temperature T= 100 – 400 °C are given. The usual representation (i.e. Z” vs. Z’ where Z’ and Z” are the real and imaginary parts of the complex impedance, respectively) as well as the alternative representations of the impedance measurement (electrical modulus representation) was used to interpret the impedance spectra of BiNbO4 ceramics in order to obtain separate contributions of the bulk, grain boundary and electrode processes. The Kramers-Kronig data validation test was employed in the impedance data analysis. Experimental data of impedance spectroscopy were fitted to the corresponding equivalent circuit using the complex non-linear least squares method. Agreement between experimental and simulated data was established.

Characterization of ZnO nanolayers by complex impedance spectroscopy

2017 ◽  
Author(s):  
Yordan Marinov ◽  
Todor Vlakhov ◽  
Blagoy Blagoev ◽  
Grzegorz Luka ◽  
Tomasz Krajewski ◽  
...  
Keyword(s):  
Impedance Spectroscopy ◽  
Complex Impedance ◽  
Complex Impedance Spectroscopy

scholarly journals Generalized Distribution of Relaxation Times Analysis for the Characterization of Impedance Spectra

Batteries ◽  
2019 ◽  
Vol 5 (3) ◽  
pp. 53 ◽  
Author(s):  
Michael A. Danzer
Keyword(s):  
Impedance Spectroscopy ◽  
Relaxation Times ◽  
Complex Impedance ◽  
Lithium Ion ◽  
Vanadium Redox Flow Battery ◽  
Impedance Spectra ◽  
Model Free ◽  
Single Polarization ◽  
Generalized Distribution

Impedance spectroscopy is a universal nondestructive tool for the analysis of the polarization behavior of electrochemical systems in frequency domain. As an extension and enhancement of the standard impedance spectroscopy, the distribution of relaxation times (DRT) analysis was established, where the spectra are transferred from frequency into time domain. The DRT helps to analyze complex impedance spectra by identifying the number of polarization processes involved without prior assumptions and by separating and quantifying their single polarization contributions. The DRT analysis, as introduced in literature, claims to be a model-free approach for the characterization of resistive-capacitive systems. However, a data preprocessing step based on impedance models is often required to exclude non-resistive-capacitive components off the measured impedance spectra. The generalized distribution of relaxation times (GDRT) analysis presented in this work is dedicated to complex superposed impedance spectra that include ohmic, inductive, capacitive, resistive-capacitive, and resistive-inductive effects. The simplified work flow without preprocessing steps leads to a reliable and reproducible DRT analysis that fulfills the assumption of being model-free. The GDRT is applicable for the analysis of electrochemical, electrical, and even for non-electrical systems. Results are shown for a lithium-ion battery, a vanadium redox flow battery, and for a double-layer capacitor.

Characterization of Bi6Fe2Ti3O18 Ceramics with Impedance Spectroscopy

2012 ◽  
Vol 730-732 ◽  
pp. 76-81
Author(s):  
Agata Lisińska-Czekaj ◽  
Dionizy Czekaj
Keyword(s):  
Impedance Spectroscopy ◽  
Simulated Data ◽  
Dielectric Behavior ◽  
Stoichiometric Mixture ◽  
Pressing Method ◽  
Fitting Method ◽  
Polycrystalline Ceramic ◽  
Method Agreement ◽  
Polycrystalline Ceramic Material

In the present research the tool of impedance spectroscopy was utilized to characterize dielectric behavior of Aurivillius-type ceramics of Bi6Fe2Ti3O18 composition fabricated by hot pressing method from the stoichiometric mixture of oxides Bi2O3, TiO2 and Fe2O3. Impedance spectroscopy was applied to characterize dielectric response of bulk, grain boundary, and material/electrode interfaces of the fabricated polycrystalline ceramic material at both room and elevated temperature. The Kramers-Kronig data validation test was employed in the impedance data analysis. Experimental data were fitted using the CNLS fitting method. Agreement between experimental and simulated data was established.

scholarly journals Impedance Spectroscopy for the Characterization of the All-Carbon Graphene-Based Solar Cell

Energies ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1908 ◽  
Author(s):  
Ilaria Matacena ◽  
Laura Lancellotti ◽  
Nicola Lisi ◽  
Paola Delli Veneri ◽  
Pierluigi Guerriero ◽  
...  
Keyword(s):  
Solar Cell ◽  
Impedance Spectroscopy ◽  
Silicon Solar Cell ◽  
Complex Impedance ◽  
Impedance Data ◽  
Circuit Representation ◽  
Gold Contact ◽  
Capacitance Voltage ◽  
Silicon Interface

In this work, front contacts for graphene-based solar cells are made by means of colloidal graphite instead of gold. The performance is characterized by exploiting impedance spectroscopy and is compared to the standard gold contact technology. Impedance data are analysed through equivalent circuit representation in terms of lumped parameters, suitable to describe the complex impedance in the frequency range considered in the experiments. Using this approach, capacitance–voltage of the considered graphene–silicon solar cell is found and the barrier height forming at the graphene–silicon interface is extracted.

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