Structure and Magnetic Properties of Nickel–Zinc Ferrite Nanoparticles Prepared by Glass Crystallization Method

Synthesis and characterization of Ni–Zn ferrite nanoparticles

“…The spectra showed characteristic peak of tetrahedral and octahedral Fe-O stretching band at 570 and 416 cm À 1 in all the samples. The intensity and peak positions of these modes vary with nickel and zinc concentration due to change in crystalline field effect and strain in lattice [15]. In addition to these vibrational modes, a broad hump due to water symmetric stretching and antisymmetric stretching with maxima at about 3400 cm À 1 and bending mode of water at 1640 cm À 1 are observed in these spectra.…”

“…For Ni 0.5 Zn 0.5 Fe 2 O 4 sample a small hysteresis is observed, indicating the ferromagnetic nature of the material at room temperature. This can be attributed to the comparatively larger crystallite size of the sample [15]. The values of saturation magnetization, remanence and coercivity are listed in Table 3.…”

Effect of Gd3+ ion distribution on structural and magnetic properties in nano-sized Mn–Zn ferrite particles

“…[20]. The intensity and peak position of these modes vary with iron and gadolinium ion concentration which is due to change in crystalline field effect and strain in the lattice [21]. In addition to this vibrational mode, a broad hump at 3400 cm À 1 and 1640 cm À 1 due to water symmetric stretching and antisymmetric stretching are also observed.…”

Annealing effect on the structural and magnetic properties of the CuAl 0.6 Cr 0.2 Fe 1.2 O 4 nano-ferrites

“…The band ν 3 may arise from splitting ν 2 by local lattice deformation caused by Jahn-Teller effect [27,28]. The band ν 4 appeared at 221 cm -1 can be attributed to lattice vibrations, where it depends on the tetrahedral divalent metal ions, i.e.…”

“…It may be due to the relaxation effect of this sample which makes the distribution of H at B-sites wider, hence its average value H B becomes smaller. The decrease in H A and H B at 1000 o C may result from the tetragonal distortion of JTEof Cu 2+ ions at these sites[28]. JTE causes elongating the crystal lattice and distorts the magnetic Fe 3+ -O 2--Fe 3+ and Cr 3+ -O 2--Fe 3+ bonds which leads to decrease in H A and H B .…”