Journal de la métallurgie des poudres et des mines

Abstrait

Structural, Magnetic and Dielectric Properties of Sm³⁺ and Mn²⁺ Co-doped BiFeO3 Nanoparticles

Ali SI*, Kiani M and Rizwan S

The structural, morphological, magnetic and dielectric properties of Samarium (Sm3+) and Manganese (Mn2+) doped Bismuth ferrite (BSFMO, Sm=5% and Mn=0%, 5%, 10%, 20%, 25%) nanoparticles are presented which were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), superconducting quantum interference device (SQUID) and LCR meter, respectively. The XRD and SEM measurement show that the nanoparticles were successfully synthesized by an improved sol-gel technique. The nanoparticles size decreases with increase in the Mn2+ concentration. The dielectric measurement revealed that the dielectric constant and dielectric loss decreases at higher frequency. The saturation magnetization and the magnetic coercivity of Mn-doped BSFO decrease by increasing Mn concentration which is attributed to the increase in Bi2Mn4O9 antiferromagnetic impurity phase and the increase in antiferromagnetic spin wavelength. Our results suggest that the resulting nano-composite is a soft ferromagnetic material and is a suitable candidate for magnetic sensors operable at room-temperature.