Synthesis and electromagnetic properties of La-doped Ni–Zn ferrites

Influence of La3+ Substitution on Structure, Morphology and Magnetic Properties of Nanocrystalline Ni-Zn Ferrite

“…Therefore, when the paramagnetic La 3+ ion replaces the Fe 3+ ion at B-site it leads to the decrease in the net overall magnetic moment. Further, the substitution of paramagnetic La 3+ ion leads to distortion of the spinel lattice thus changes the spin magnetic moment between the A-B sublattices into nonlinear antiferromagnetic coupling [15, 69, 70]. The above discussion confirmed the reduction in the magnetization of prepared ferrite nanocrystals samples at lanthanum ion concentration at above X ≥ 0.06.…”

“…Hence, the lattice constant should be aggrandized with the increasing content of the La 3+ during the substitution process [15, 52]. Besides that, the decrease in lattice constant with the increase of La 3+ content could be attributed to the compression of spinel lattice induced by the secondary phases due to the difference in thermal expansion coefficients [42, 53] .…”

“…Generally, this type of ferrites is called as a hopping semiconductor, where their conducting properties are the thermally activated hopping of electrons from one to another cation [10]. There is numerous attempt have been made in order to enhance the qualities of ferrites by incorporating the same suitable nonmagnetic/diamagnetic impurities with different valence state at the A and B sites includes Copper [11, 12], Manganese [13], Praseodymium [14], Lanthanum [15], Neodimium [16] ion and etc [17]. Lanthanum is known as the second most abundant and lightest rare earth element (REE) in the lanthanide series.…”

“…The obtained results showed an appearance of small peaks which represents the secondary phase due to the addition of lanthanum ion. Wang et al [15] prepared Ni 0.8 Zn 0.2 La x Fe 2−x O 4 nanomaterial by sol gel method. The structural and morphological nalaysis of obtained samples shows that the addition of lanthanum ion has reduced the grain size.…”

Effect of lanthanum substitution on structural and magnetic properties of nickel zinc ferrites

“…The iron replacement in the B-sublattice by lanthanum, with larger radius, results in expansion of unit cell. 13 The crystallite size values variation can be attributed to the strain in the lattice, as a result of lanthanum presence in B-sublattice, 14,15 and to the compression by the secondary phase, 12 which affect the growth of a grains. The presented results also show the theoretical density increase, which may be caused by a non-stoichiometric excess Ni 2+ -Zn 2+ in compound, associated with a lack of iron in the system 16 and by a sintering mechanisms activated by lanthanum ions.…”