Effect of Particle Size on Magnetic and Dielectric Properties of Nanoscale Dy-Doped BiFeO3

Sol–gel synthesized BiFeO3 nanoparticles: Enhanced magnetoelelctric coupling with reduced particle size

“…This reduction in Gibb's free energy acts as the driving force for nucleation and growth of nanoparticles. In accordance with the theory, the size of the formed nuclei reduces as the formation temperature decreases, Significant effect of calcination temperature on the nanoparticles has been observed: The grains formed at smaller calcination temperature coalesce to form bigger ones via diffusion through grain boundaries [11] -this observation is also in agreement with the XRD results. Fig.…”

“…Also, amongst four types of polarizations (electronic, dipolar, ionic, and interfacial), only electronic polarization contributes at high frequencies. This also decays dielectric constant at higher frequencies [11].…”

“…BiFeO 3 nanoparticles were prepared by sol-gel method, described elsewhere [11]. The soobtained powder were calcined at different temperatures viz.…”

“…This observation corroborates well with crystallite size, determined from Eq. 1; this may be attributed to the merging of smaller grains via diffusion through grain boundaries, which enlarge crystallite size [11].…”

“…high leakage current density, weak magnetism, and low magnetoelectric coupling values [4][5]. Reduction of size to nano scale has proven to be quite efficient in enhancement of its multiferroism [4][5][6][7][8][9][10][11]. Park et al reported strong dependence of magnetism of single crystalline BiFeO 3 nanoparticles [4].…”