Effects of Calcination Temperature on the Structural and Magnetic Properties of NiFe₂O₄Nanoparticles

Abstract

NiFe 2 O 4 nanoparticles have been synthesized by water-in-oil microemulsion method. Effects of calcination temperature varying from 600 to 1200 • C on the structural and magnetic properties of NiFe 2 O 4 nanoparticles have been investigated. Studies carried out using XRD, SEM and VSM techniques. Results indicated that magnetic properties of NiFe 2 O 4 nanoparticles showed great dependence on the variation of the crystallinity and particle sizes caused by the calcination temperature. The crystallization, saturation magnetization Ms and remenant magnetization Mr increased as the calcination temperature increased. But the variation of coercivity Hc was not in accordance with that of Ms and Mr, indicating that Hc was not determined only by the crystallinity and size of NiFe 2 O 4 nanoparticles.