Synthesis and Investigation of Electrical Properties of Strontium Metal-Doped Hexaferrite Nanoparticles

In the current work cobalt, magnesium and lithium dopant substitution is performed in series of SrFe(12-2x)(Co,Mg,Li)(x)O-19 (for x = 0.0, 0.15, 0.25, 0.5) using sol-gel method. The prepared samples were calcined at 950 degrees C for 4h. The synthesized samples were characterized using X-ray diffraction (XRD), scanning electron microscope (SEM), and Fourier transform infrared spectroscopy (FTIR). LCR meter was used for performing dielectric measurements. The formation of hexagonal SrFe(12-2x)(Co,Mg,Li)(x)O-19 was confirmed using XRD. Debye Scherer was used to determining the crystallite size in the range of 37-57 nm. The band positions were studied using FTIR. The real part of the dielectric constant enhanced to 77.8 at 250 Hz for x = 0.5. The value of dielectric loss for cobalt, magnesium, and lithium-doped strontium hexaferrite nanoparticles has increased from 2.21 to 54.0 at 250 Hz. AC conductivity values also showed an increase as the concentration increased in strontium hexaferrite. AC conductivity results explain that electron hopping governs the conduction process. The electrical properties and conductivity rise with the increasing concentration of dopant. The enhanced dielectric properties and increased conductivity of the prepared nanoparticles make it applicable in supercapacitors and charge storage devices.

Automated summary

In this study, cobalt, magnesium and lithium dopant substitutions were performed in SrFe(12-2x)(Co,Mg,Li)(x)O-19 using sol-gel method. The synthesized samples were characterized by XRD, SEM, and FTIR, showing enhanced dielectric properties and increased conductivity with increasing dopant concentration. The results suggest potential applications of the prepared nanoparticles in supercapacitors and charge storage devices.