Dielectric Relaxation, Conductivity Mechanism and Complex Impedance Spectroscopic Studies of Pure and Cadmium Mixed Cobalt Levo-Tartrate Crystals

Abstract

Cadmium tartrate is known for piezoelectric application and cobalt tartrate finds application in electrochemical depositions. Therefore, in the present study, an attempt is made to grow mixed levo-tartrates of cobalt and cadmium. The pure and mixed levo-tartrate crystals of cobalt and cadmium with different volume concentration of cobalt nitrate and cadmium nitrate solutions are grown by using gel growth technique. Brownish spherulitic crystals are grown. The EDAX study confirms the exact composition of cobalt and cadmium in the grown crystals. The impedance spectroscopic studies are carried out on pelletized samples from 100 Hz to 1 MHz frequency range at room temperature. The Nyquist plots exhibit one semicircle for pure and mixed crystals of cobalt and cadmium levo-tartrate due to grain contribution only. An attempt is made to provide equivalent R-CPE network for the grain contribution. The dielectric constant and dielectric loss decreases with increase in frequency. The Jonscher's power law is studied for ac conductivity and applied to the conductivity phenomena in pure and mixed crystals of cobalt and cadmium levo-tartrate. From the detailed impedance and dielectric analysis, it is found that different ac electrical and dielectric parameters are sensitive to the addition of cadmium and its concentration in cobalt levo-tartrate crystals.

Voigt Profile is Suitable for Impedance Spectroscopic Analysis of BLSF Ceramics

“…The same criterion is applicable to advanced spectroscopic data. Moreover, the FWHM of the Voigt profile along with its parameters has a low signal-to-noise ratio [8,9]. The Voigt function is considered particularly significant for representing the symmetric features of any respond peak profile due to its theoretical importance and practical suitability for fitting into peaks of experimental data [5][6][7]10].…”