Abstract:
The aim of this project was to investigate the influence of Mn doping on structural, dielectric,
magnetic, magnetoelectric and optical properties of bismuth ferrite (BiFeO3). The sol-gel process is a
chemical synthesis of the oxides from the soluble precursors involving the hydrolysis and condensation of
metal alkoxides. Sol gel technique was used to synthesize 5, 10 and 15 mol% Mn doped BiFeO3
nanoparticles. The XRD result showed phase structural transition from rhombohedral to orthorhombic
for 15 mol% Mn doped BiFeO3 sample. Magnetic measurements revealed the enhancement of
ferromagnetic property with increasing Mn doping in BiFeO3. The characteristic dielectric anomaly,
expected in the around particular of antiferromagnetic transition temperature TN (Neel temperature)
was found in all Mn doped BiFeO3 samples. The magnetoelectric coupling was evidenced by the
change in capacitance with the change in the applied magnetic field. On increasing Mn concentration
from 5 to 15 mol% in BiFeO3, a change in magnetocapacitance from 1.46% to 2.6% showed the
improvement of multiferroic properties. In order to explore the optical properties of Mn doped BiFeO3
nanoparticles, their photoluminescent properties were also studied.
