Structural, dielectric, and electrical study of bismuth ferrite-lithium vanadate

Abstract

The composite, BiFeO3-LiVO3 was synthesized through a solid-state reaction technique. The X-ray diffraction (XRD) confirmed the formation of the tetragonal structure at room temperature. The dielectric constant and dielectric loss increases with rise in temperature. The Nyquist plot projected the contribution of bulk effect and a slight indication of grain boundary effect. The presence of a temperature-dependent relaxation process occurred in the material. Electrical modulus confirmed the non-Debye type and indicated the asymmetric peak broadening for the spread of relaxation times. The activation energies were calculated from the ac conductivity by linear fitting. The activation energy calculated from the complex impedance plot and the fitted Johnscher power law was very close which implied a similar type of charge carrier which exists in the conduction mechanism for the system. Thermistor parameters were evaluated using the grain resistance for different temperatures.