Structural and magnetic properties of BaFe_9.95Al₂Mg_0.05O₁₉tuned through sintering temperature

Abstract

The sintering temperature is a key way to tune the structural and magnetic properties of M-type hexaferrites. Here the effect of sintering temperature on BaFe9.95Al2Mg0.05O19 M-type hexagonal Ba-hexaferrites was studied. X-ray diffraction analysis revealed the presence of Fe2O3 impurity phases in all samples. The results showed that as the sintering temperature increased, the saturation magnetization and remanence ratio initially increased, then decreased at higher temperatures. On the other hand, the coercivity and magnetocrystalline anisotropy field decreased first, then increased. The morphology suggested that average grain size consistently grew between 800-2800 nm with increasing temperature. The optimal magnetic properties of BaFe9.95Al2Mg0.05O19 were achieved at a sintering temperature of 1280 ℃, with saturation magnetization 49.94 emu/g, coercivity 4.99 kOe, anisotropic field 1.5kOe, and magnetic moment of 9.4097µB. The findings suggest that the magnetic properties of M-type hexagonal ferrites can be significantly enhanced by optimizing the sintering temperature, which has implications for the development of high-performance self-biased circulators, Magnetic filters, and other magnetic applications.

Effect of ferromagnetic cobalt on characteristics of coercive Aluminium substituted BaFe11.5Al0.5O19 hexaferrites

“…The changes in lattice parameters happened due to the induction of doping contents in the under consideration samples. Other structural parameters of the synthesized material, including the average dimension of crystallite D, porosity P, bulk density (d b ), and x-ray density(d x ), were also computed as reported in previous literature [13]. To check the possible empty spaces in the material, dislocation density (δ) was calculated using the formula below [54].…”

“…These properties make M-type hexaferrites attractive in numerous magnetic devices, such as permanent magnets, micro-wave devices, and magnetic recording media [8][9][10]. They are crucial in the enterprise of micro-wave instruments (such as phase shifters, circulators, and filters), biomedical applications, and chemical sensing [11][12][13].…”