Conductivity behavior and impedance studies in BaTiO3–CoFe2O4 magnetoelectric composites

摘要: Abstract Two phase magneto-dielectric composite of Barium titanate and Cobalt ferrite (BT-CFO) has been prepared via solid state reaction technique. The structure investigated by Raman spectroscopy confirms the presence phase. Electrical properties BT-CFO composites were studied thoroughly in 100 Hz to 1 MHz frequency range 50 °C–450 °C temperature range. dielectric measurements reveal Maxwell-Wagner polarization thermal activated relaxation process arising from movement defects ions BT composites. Particularly BT-5CFO exhibited a surprising low loss ≈0.3 over 100 Hz-1MHz promises industrial application. variation Impedance parameters reveals resistive nature two thermally mechanism present modulus studies confirm non-Debye type processes prevalent electrical conduction occurs through over-lapping large polaron tunneling (OLPT) non-overlapping small (NSPT) at temperatures correlated barrier hopping (CBH) high addition CFO localizes polarons enhances conductivity. coupling effect (% MD) is found have maximum value 1.2 magnitude 7 kOe for increases with amount composite. These results could be beneficial enhancing based systems.