Synthesis and magnetic properties of spinel NiFe2O4 nanoparticles by oxidation roasting technique

• New understanding on oxidization roasting process of nickel ferrites is clarified. • Metallurgical property of nickel ferrites was discussed successfully. • Oxidization behavior and consolidation mechanism is discussed in preparation of spinel NiFe 2 O 4 nanoparticles . • Evolution mechanism of spinel NiFe 2 O 4 nanoparticles is clarified. An oxidization roasting technique has been reported to be an effective route to synthetize nickel ferrite (NiFe 2 O 4 ) with an inverse spinel crystal structure. In the present work, the interfacial reaction behavior and formation mechanism were clarified during the synthesis of nickel ferrite NiFe 2 O 4 . The nickel ferrite (NiFe 2 O 4 ) with a saturation magnetization (Ms) of 37.96 emu/g was successfully synthesized. The synthesized NiFe 2 O 4 particles had a pore volume of 0.001 cm 3 /g, a total pore volume of 0.004 cm 3 /g, a specific surface area (SSA) of 1.28 cm 2 /g nm, and an average pore size (SPA) of 1.28 nm. The nickel ferrite NiFe 2 O 4 was classified as having a reverse spinel crystal structure in which the mixed spinel nickel ferrites were transformed into an inverse spinel structure. Furthermore, the nickel ferrite (NiFe 2 O 4 ) could be successfully synthesized via oxidization roasting technique, which could be extended to fabricate other spinel ferrite particles of interest.