Dielectric and tunable ferroelectric properties in BiFeO3-BiCoO3-BaTiO3ternary compound

The ternary compound BiFeO3-BiCoO3-BaTiO3(BFO-BCO-BT) was prepared using the solid-state reaction method. The dielectric studies display strong frequency-dependent anomaly in the vicinity of Curie temperature (T-C) approximate to 350 degrees K and exhibit strong diffusive relaxor behavior with (gamma approximate to 1.61). The dielectric measurements confirm stabilization in BFO-BT solid solution due to BCO addition. The P-E loops display strong ferroelectric behavior and frequency variation indicating major dominant domain wall movement on high dielectric constant in the BFO-BCO-BT ternary compound. The magnetic field variation in theP-Eloop displays strong magnetoelectric coupling originating from interfacial polarization with maximum coupling coefficient of 115 mV/cm-Oe at field of 500 Oe. The temperature variation ofP-Eshows enhanced configurational entropy due to increase in activation energy, with the highest isothermal energy (Delta S) = 0.15 J/kg/K obtained forE = 15 kV/cm andT = 125 degrees C. These studies provide tunable ferroelectric properties of BFO-BCO-BT for exploration of promising applications such as refrigeration and magnetoelectricity.