Affiliation:
1. PG & Research Department of Chemistry, Thiru.Vi.Ka. Government Arts College (Affiliated to Bharathidasan University), Thiruvarur-610003, India
2. PG & Research Department of Physics, St. Joseph’s College of Arts and Science (Autonomous) (Affiliated to Annamalai University), Cuddalore-607001, India
Abstract
Cobalt aluminum ferrites were synthesized by coprecipitation method at 1000 ºC. XRD studies pointed
out the employed samples (Fe2+Al2
3+O42−, Fe0.25Co0.75Al2O4 and Fe0.75Co0.25Al2O4) were crystallized in a
single phase cubic spinel form. The synthesized samples were calculated structural parameters such
as crystallitesize (D: 17 nm), X-ray density (Dx: 3.97 to 4.15 g/cm3), volume of the unit cell (V: 583.64
to 586.58 Å), lattice strain (ε: 6.9 × 10-3), dislocation density (δ: 3.3 × 10-3) and lattice constant (a:
8.357 to 8.371 Å). The FE-SEM microstructure confirmed that various concentrations result in different
particle sizes (5 μm to 500 nm). The magnetic characteristics were investigated by VSM and magnetic
parameters like saturation magnetization (Ms: 4.82 × 10-3 to 0.673 emu/g), retentivity (Mr: 1.545 × 10-3
to 0.229 emu/g), coercivity (Hc: 775.45 to 2212.8 Oe), magnetic moment (μB: 1.57 × 10-4 to 2.108 ×
10-2), remnant ratio (R: 0.32 to 0.357 no unit) and anisotropy constant (K: 3.418 to 177.57 J/m3) were
calculated. High coercivity materials are ideal for use in magnetic recording media, permanent magnets
and microwave devices since they possess a high degree of resistance to an external magnetic force.
Publisher
Asian Journal of Chemistry