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Dimitrovskalazova, Sandra
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article
Impedance and AC Conductivity of <scp><scp>GdCr</scp></scp><sub>1−<i>x</i></sub><scp><scp>Co</scp></scp><sub><i>x</i></sub><scp><scp>O</scp></scp><sub>3</sub> (<i>x</i> = 0, 0.33, 0.5, 0.67 and 1) Perovskites
Abstract
<jats:p>Perovskite series <jats:styled-content style="fixed-case"><jats:roman>GdCr</jats:roman></jats:styled-content><jats:sub>1−<jats:italic>x</jats:italic></jats:sub><jats:styled-content style="fixed-case"><jats:roman>Co</jats:roman></jats:styled-content><jats:sub><jats:italic>x</jats:italic></jats:sub><jats:styled-content style="fixed-case"><jats:roman>O</jats:roman></jats:styled-content><jats:sub>3</jats:sub> (<jats:italic>x</jats:italic> = 0, 0.33, 0.5, 0.67 and 1) was obtained using a solution combustion method. The powder <jats:styled-content style="fixed-case">XRD</jats:styled-content> was used for identification and structural characterization of the obtained perovskites. All compounds crystallize within the space group <jats:italic>Pnma</jats:italic>. The morphology of samples was studied using <jats:styled-content style="fixed-case">SEM</jats:styled-content>. The impedance and <jats:styled-content style="fixed-case">AC</jats:styled-content> conductivity of <jats:styled-content style="fixed-case"><jats:roman>GdCr</jats:roman></jats:styled-content><jats:sub>1−<jats:italic>x</jats:italic></jats:sub><jats:styled-content style="fixed-case"><jats:roman>Co</jats:roman></jats:styled-content><jats:sub><jats:italic>x</jats:italic></jats:sub><jats:styled-content style="fixed-case"><jats:roman>O</jats:roman></jats:styled-content><jats:sub>3</jats:sub> 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 <jats:styled-content style="fixed-case">DC</jats:styled-content> conductivity, with increasing of the value of <jats:italic>x</jats:italic> in the structures, were observed. The <jats:styled-content style="fixed-case">AC</jats:styled-content> conductivity obeyed the universal power law, σ(ω) = σ(0) + <jats:italic>A</jats:italic>ω<jats:sup><jats:italic>n</jats:italic></jats:sup> 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.</jats:p>