I have carried out impedance spectroscopy of my sample in the temperature range of 303-373 k, in complex impedance spectra I try to feet my data with using equivalent R-C circuit and evaluating the value of R and C. All the nyquist plot consist of 3 depressed semi-circle from higher to lower frequencies. So first circle at higher frequency I assigned as a bulk resistance and bulk capacitance. generally the value of bulk resistance is decreased with increase in temperature but in my case the bulk resistance gives random value for different temperature. so what are the reasons for such type of behavior. My nyquist plots also consist series resistance.
The bulk resistance follows the Arrhenius law in different temperature. The activation energy values at low temperature and high temperature are difference. In generally the value of bulk resistance is decreased with increase in temperature What is your system and measures experimental condiditions?
my sample is Cobalt sulfide nanoparticle and we carried out it using solitron impedance analyzer.
Dear Jaydeep Joshi,
Dr Shen-Ming Chen has answered very well.
Cobalt sulfide exhibits magnetic hysteresis typical of a ferromagnet at room temperature and a peak in magnetization at low temperature with a strong relaxation indicating possibles pin glass state.
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