Application of AC Impedance Spectroscopy for Characterization of BiNbO₄ Ceramics

Abstract:

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.

• Periodical: Key Engineering Materials (Volumes 512-515)
• Pages: 1193-1197
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.512-515.1193
• Online since: June 2012
• Authors: Agata Lisińska-Czekaj, Beata Wodecka-Duś, Dionizy Czekaj
• Keywords: BiNbO₄ Ceramics, Equivalent Electric Circuit, Impedance Spectroscopy

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