Studies on Conduction Mechanism and Dielectric Properties of Pr0.65Ca0.25Ba0.1MnO3 Compound

Electrical responses and dielectric behaviors of Pr0.65Ca0.25Ba0.1MnO3 were detailed using impedance spectroscopy impedance. The investigation of DC electrical conductivity indicates that the sample shows a semiconductor behavior. In the high-temperature region, the resistivity data was described by the Holstein non-adiabatic small polaron hopping model in the high-temperature region. Conductivity spectra were analyzed based on the double and single Jonscher laws at low temperatures and on the Drude law at high temperatures. In the intermediate frequency part, the electrical transport is governed by the overlapping-large polaron tunneling (OLPT) and the correlated barrier hopping (CBH) models. However, the non-overlapping small polaron tunneling (NSPT) process dominated the transport behavior at the high-frequency side. The scaling behavior of conductivity indicated the non-validity of TTSP application. The dielectric permittivity as a function of temperature is characterized by the absence of dielectric transition which is explained by the disorder of cation sublattices.