Investigations of electrical properties of Pr0.65Ca0.25Cd0.1MnO3 ceramic

Pr0.65Ca0.25Cd0.1MnO3 ceramic was elaborated using the conventional solid-state reaction technique. The polycrystalline sample was subjected to investigate by ac impedance spectroscopy. From the main results, the electrical conductivity analysis confirms the semiconductor behavior and indicates that the hopping process governs the electrical conductivity. From ac-conductivity, two distinct mechanisms are observed. Indeed, the conduction mechanism is attributed to the correlated barrier hopping model in the middle of the frequency region and the overlapping large polaron tunneling in the high-frequency one. The analyzed impedance and modulus confirmed the presence of non-Debye-type relaxation phenomenon. Different electrical equivalent circuits were used to analyze the Nyquist plots. The obtained results confirm the contribution of grain boundary on the conduction. The increase in dielectric constant and the rate of its increase at low frequency were related to the disorder of the cation sublattices.