Y-Type Strontium Hexaferrite: the Role of Al Substitution, Structural, and Magnetic Consequence

Abstract

In this study, Y-type Sr-hexaferrite nanoparticles with nominal chemical composition of Sr2Co2Fe12−y/2Al y/2O22 (y = 0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0) were synthesized by a co-precipitation method. Crystal structure, morphology, and magnetic consequence of nanoparticles were characterized by employing X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy dispersive analysis of X-ray spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR), and vibrating sample magnetometer (VSM), respectively. XRD spectra revealed that the high-purity hexagonal Sr2Co2Fe12−y/2Al y/2O22 single phase was formed at synthesis temperature of 900 °C or 1 h. It was also found that the crystallite size of nanoparticles was increased from 32.8 to 37.6 nm by an increase in the substitution content. FE-SEM results showed that the particle size increased with an increase in aluminum ion substitution, and the morphology of particles was gradually turned from irregular platelet to pyramidal shapes. The FTIR analysis was employed to approve different bond modes which were structured. The VSM analysis showed that, with an increase in amount of substitution, the coercivity decreases from 456 to 98 Oe.