Structural and electrical properties of lead-free (1-x)Bi0.5Na0.5TiO3-xNi0.5Zn0.5Fe2O4 based magnetoelectric composites

摘要

Lead-free magnetoelectric (ME) composites of (1-x) Bi0.5Na0.5TiO3 – x Ni0.5Zn0.5Fe2O4 (x = 0, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 1) were successfully synthesized by using sol-gel method. The phase purity and microstructure of composite ceramics were analyzed through x-ray diffraction (XRD) pattern and scanning electron microscope (SEM) images. The study of dielectric behavior reveals the insulating nature of composite ceramics. The highest value of dielectric constant (i.e. 532 at 1 kHz) and lowest tan δ (i.e. 0.07 at 1 kHz) was observed for x = 0. The dielectric constant decreases, whereas tan δ increases with NZFO concentration. The giant magnetocapacitance coefficient (MC %) was observed for x = 0.20 i.e. 27.48 % around 3 kOe at 1 kHz.