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

N.H. Manani¹ , H.O. Jethva² , M.J. Joshi³

Section:Research Paper, Product Type: Journal-Paper
Vol.8 , Issue.1 , pp.8-15, Feb-2020

CrossRef-DOI:   https://doi.org/10.26438/ijsrpas/v8i1.815

Online published on Feb 28, 2020

Copyright © N.H. Manani, H.O. Jethva, M.J. Joshi . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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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.

Key-Words / Index Term :
ac conductivity, Cobalt cadmium mixed levo-tartrate crystals, dielectric study, gel growth, impedance spectroscopy, Jonscher’s law

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