Impedance and AC Conductivity of GdCr1−xCoxO3(x = 0, 0.33, 0.5, 0.67 and 1) Perovskites

Pecovska-Gjorgjevich, Margareta and Aleksovska, Slobotka and Marinšek, Marjan and Dimitrovska-Lazova, Sandra (2014) Impedance and AC Conductivity of GdCr1−xCoxO3(x = 0, 0.33, 0.5, 0.67 and 1) Perovskites. Journal of the American Ceramic Society, 97 (12). pp. 3864-3871. ISSN 00027820

[thumbnail of J Am Cer Soc paper Aleksovska et al.pdf]
J Am Cer Soc paper Aleksovska et al.pdf

Download (1MB) | Preview


Perovskite series GdCr 1 – x Co x
(x = 0, 0.33, 0.5, 0.67 and 1)
was obtained using a solution combustion method. The powder
O 3 XRD was used for identification and structural characterization
of the obtained perovskites. All compounds crystallize
within the space group Pnma. The morphology of samples was
studied using SEM. The impedance and AC conductivity of
GdCr 1 – x Co x O
were studied using impedance spectroscopy in
a frequency range from 10 Hz to 10 MHz and in temperature
interval 297–337 K. Changes in electric modulus and DC conductivity, with increasing of the value of x in the structures, were observed. The AC conductivity obeyed the universal
power law, r(x)=r(0) + Ax 3 n
and revealed semiconductor
behavior. The calculated activation energies of existing processes varied with the cobalt content and applied frequency.
The impedance spectra showed non-Debye behavior with a distribution of relaxation times for relaxation and conductive processes.
The conduction mechanism for pure orthochromite and
orthocobaltite was defined and two types of conduction were
observed in the investigated temperature range for the complex perovskites. In order to explain the results, an equivalent circuit with fitted values of circuit components was proposed.

Item Type: Article
Subjects: Medical and Health Sciences > Basic medicine
Natural sciences > Chemical sciences
Natural sciences > Physical sciences
Divisions: Faculty of Medical Science
Depositing User: Rubin Gulaboski
Date Deposited: 19 Dec 2014 11:37
Last Modified: 19 Dec 2014 11:37

Actions (login required)

View Item View Item