Evolution of structure and magnetic properties with annealing temperature in nanoscale high-energy-milled nickel ferrite

Influence of the sintering temperature on the magnetic and electric properties of NiFe2O4 ferrites

“…Me-ferrites in polycrystalline form may be obtained by several preparation methods, such as solid state reaction, co-precipitation, mechano-chemical, combustion, or sol-gel [10][11][12][13] . However, variations in synthesis conditions such as sintering time, temperature, atmosphere and thermal annealing will influence final composition and grain size 13,14 . One of the most important members of Me-Ferrite systems is the nickel ferrite, or NiFe 2 O 4 , which is a soft magnetic material with an inverse spinel structure.…”

Structural and Magnetic Properties of LiZnO Added MgFe2O4Composite

“…Magnetic properties were recorded using a vibrating sample magnetometer (VSM, Lakeshore, USA) after calibration with a nickel standard sample. [12]. Weak (111) and strong (220) peaks indicate an inverse type spinel for the present samples [13].…”

“…Weak (111) and strong (220) peaks indicate an inverse type spinel for the present samples [13]. The intensity of (220) depends on the cations present in the tetrahedral sites and the intensity of (222) was related to the cations in the octahedral sites [12]. In order to find the relation between magnetic ions and the magnetization, ratios of the relative intensities of the (220) and (222) lines were calculated and plotted as shown in Fig.…”

“…5, 6), [14]. Since the magnetic material pre- sent in the composites is of the inverse spinel type with polyhedral sites, variation of cations contributing to magnetization with respect to the annealing temperature was investigated in correlation with the structural changes occurring due to the annealing temperature via analysis of X-ray diffraction patterns [12]. Migration of cations among tetrahedral and octahedral sites was calculated by comparison of intensities of diffraction peaks corresponding to tetrahedral and octahedral sites, as shown in Fig.…”

Effect of Substitution of Al for Fe on Magnetic Properties and Particle Size of Ni-Co Nanoferrite

“…There are more evidences of change in magnetization with the change of nanoparticles size, with a general conclusion that in smaller particles the reduction of magnetization is more pronounced [4]. Magnetization reduction was connected to cation redistribution (reduced concentration of iron cations on tetrahedral sites) and to spin non collinearity [11].…”