Nickel ferrite ceramics: combustion synthesis, sintering, characterization, and magnetic and electrical properties

Nickel ferrite powders were prepared by combustion synthesis of Fe, Fe2O3 and NiO using NaClO4 as fuel. ceramics fabricated single-step two-step sintering under various conditions. The effects each process on the densification, microstructure properties investigated. X-ray diffraction analysis as-prepared as-fabricated confirmed a single-phase NiFe2O4 with cubic spinel crystal structure. Single-step produced wider density range (3.63–3.97 g/cm3) than (3.74–3.84 grain size (1.10–2.31 µm compared to 1.30–1.37 µm). Two-step greater microhardness (135.00-172.60 HV) (65.33-153.00 HV). In both methods, higher temperatures saturation magnetization (Ms). highest Ms values 62.84 emu/g from at 1200°C 70.00 T2 = 1150°C: Hc was, respectively, 31.18 22.00 Oe. ceramic sintered method 1150°C presented superparamagnetic-like behavior multi-domain magnetic materials, high µi very low Hc. electrical resistivity (R), dielectric constant (?r) quality factor this support high-frequency data storage applications.