Incorporation of Co (x), Al (y) into Bi (0.99) Ba (0.1) Fe (1-x-y) O3 and its effect on the microstructural, magnetic, and dielectric properties

The work is focused on synthesizing Bi (0.99) Ba (0.1) Fe (1-x-y) Co (x) Al (y)O3 with composition (x = 0, y = 0), (x = 0.1, y = 0) and (x = y = 0.1) using solgel method and investigating magnetic and dielectric properties at room temperature. The obtained Nanoparticles in the form of fine powder have undergone pre-sintering at 200 °C for 2 h and after that sintering at 500 °C for 3 h. The structural and morphological studies were investigated using X-ray diffraction (XRD) and FE-SEM. The XRD analysis reveals the presence of BiFeO3 with rhombohedral R3C group along with the impurity phases. The crystallite size is found to decrease along with the shrinkage in Lattice Constant. The SEM images show the formation of irregular and heterogeneous structures. It has been observed that the addition of Co followed by Al is found to reduce impurity phases. The presence of Co and Al is confirmed by EDX mapping. The VSM (Vibrating sample magnetometer) is used to investigate room-temperature magnetism by plotting the Hysteresis loop. The magnetic study reveals that subsequent addition Co and Al has offered improved magnetic properties attaining maximum Hc =1570 Oe at room temperature. The dielectric response as a function of Frequency from 100 Hz to 10 MHz is observed. The change in the dielectric constant and reduction in dielectric loss are observed.