Comparative study of structural and magnetic properties of Ni and La substituted calcium hexaferrite

Abstract

Ni and La substituted M-type Ca hexaferrite of composition CaNi 1 Fe 11 O 19 and CaLa 1 Fe 11 O 19 were synthesized by sol-gel auto combustion method using metal nitrates as oxidants and citric acid as reducing agent. The prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), energy dispersive X-ray analysis (EDAX), and vibrating sample magnetometry (VSM). XRD study revealed that both samples had lattice parameters a and c within the range of M-type hexaferrite. The SEM micrographs displayed grains having irregular shapes and sizes in the nanometer range. FTIR peaks confirmed the structure of M-type hexaferrite. EDAX spectra showed the homogeneous distribution of ions in both samples. In CaNi 1 Fe 11 O 19 , we found saturation magnetization (M s ) of 12.18 emu/g and coercivity (H c ) of 193.2 Oe. On the other hand, in CaLa 1 Fe 11 O 19 , we found M s of 0.55 emu/g and H c of 404.4 Oe. Saturation magnetization and coercivity values obtained for La substituted M-type Ca hexaferrite are suitable for low-density magnetic recording devices.

Synthesis, structure, oxygen stoichiometry, and electrical properties of doped ruddlesden-popper strontium cobaltite Sr1·875Ce0·025CoO4-δ, Sr1·875Ce0·025Co0·75Ni0·25O4+δ novel compounds

“…The compounds were synthesised using two different routes [ 14 ]. However, from the same starting materials and at the same heating temperature for the same heating duration.…”

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

“…Figure 6 provides the details of the interplanar distance of hard magnetic phase 0.27nm, which belongs to CaFe 12 O 19 (107) crystallographic plane (Shinde and Dahotre, 2021) and soft magnetic 0.25 nm magnetic phases belongs to MnFe 2 O 4 (311) crystallographic plane (Zipare et al, 2015). The lattice fringes of both hard and soft magnetic phases are well matched with the theoretical values from P63/mmc and Fd-3m for the calcium hexaferrite (CaFe 12 O 19 ) and manganese ferrite (MnFe 2 O 4 ) phases, respectively.…”