Synthesis and characterization of aluminium substituted calcium hexaferrite

Abstract

Al substituted M type Ca hexaferrite with composition CaAl x Fe 12-x O 19 (x ¼ 0, 0.2, 0.4, 0.6, 0.8) were synthesized by sol gel auto combustion method. The prepared samples were characterized by XRD, SEM, FTIR and VSM. X ray diffraction study shows that the with increasing aluminum ion concentration lattice parameter a decreases from 5.87 A to 5.83 A while the lattice parameter c decreases from 22.15 Å to 22.00 Å are well within the range of M type of hexaferrite. The crystallite size of the particles decreases from 74.36nm to 62.12nm are suitable for magnetic recording. Morphology of the particles from SEM images was hexagonal platelet. The absorption band between 580 and 440cm À1 in FTIR confirm the formation of hexaferrite. The magnetic properties of the samples changes with Al ion substitution make the material suitable for low density longitudinal and perpendicular magnetic recording.

Influence of Gd and Ni doping on the structural, morphological, and magnetic properties of M-type calcium hexaferrite

“…When Gd and Ni doping in Ca 1− x Gd x Fe 12− x Ni x O 19 increases, a change in magnetic properties could be seen. The observed saturation magnetization values are almost the same as those previously reported by V. S. Shinde et al 42 Thus, the magnetic characteristics of the oxide materials can be modified by applying strain and doping significant components into the lattice site. The superexchange interaction produced by Fe and O, Fe–O bond length, and Fe–O–Fe bond angle, all have an important role in understanding the magnetic properties of ferrite materials.…”

“…36,37 The presence of Ni-Ti co-substitution leads to a decrease in saturation magnetization and coercivity, while also resulting in a maximum value of magnetic permeability at x = 0.9, followed by a subsequent decrease 38 and Table 1 provides an overview of the structural and magnetic properties discussed in the literature. [39][40][41][42] The doping of Gd at this Ca site and Ni at the Fe site has not been studied yet. Herein, we study the impact of substituting Gd 3+ and Ni 2+ ions on the properties of CaFe 12 O 19 .…”

“…36,37 The presence of Ni–Ti co-substitution leads to a decrease in saturation magnetization and coercivity, while also resulting in a maximum value of magnetic permeability at x = 0.9, followed by a subsequent decrease 38 and Table 1 provides an overview of the structural and magnetic properties discussed in the literature. 39–42…”

Performance evaluation of dextran-coated CaFe12O19/MnFe2O4 exchange-spring composites for the self-heating properties at radio frequency field

“…Where, the lattice parameter is denoted by a, interplanar spacing is denoted by d, and h, k, and l are the miller indices for the respective planes. The lattice constants (a and c) and lattice Volume of unit cell (V cell ) of calcium hexaferrite (hard ferrite), which has a hexagonal close packed (hcp) structure, were calculated by using following equations ( Shinde et al, 2020 ), …”

Implementing Machine Learning in Laboratory Synthesis by Hybrid of SVR Model and Optimization Algorithms

“…Due to their low price, abundant access to the ingredients and satisfactory properties such as high chemical resistance, large uniaxial magnetic anisotropy and chemical stability, these types of materials contribute to a wide range of applications in the fields of static and dynamic, medical, mechanical, electrical and electronic engineering. [1][2][3] The potential to become a permanent magnet is real for materials whose nature is ferromagnetism or ferrimagnetism. Ferrite magnets with the nature of ferrimagnetism are one of the most explored and satisfactory compounds in this field.…”