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

Abstract

Lanthanum substituted Ni-Zn ferrite nanoparticles (Ni0.5Zn0.5LaxFe1-xO4; 0.00 ≤x≤ 1.00) synthesized by sol-gel method were presented. X-ray diffraction patterns reveal the typical single phase spinel cubic ferrite structure, with the traces of secondary phase for lanthanum substituted nanocrystals. In addition, the structural analysis also demonstrates that the average crystallite size varied in the range of 21–25 nm. FTIR spectra present the two prominent absorption bands in the range of 400 to 600 cm-1 which are the fingerprint region of all ferrites. Surface morphology of both substituted and unsubstituted Ni-Zn ferrite nanoparticle samples was studied using FESEM technique and it indicates a significant increase in the size of spherical shaped particles with La3+ substitution. Magnetic properties of all samples were analyzed using vibrating sample magnetometer (VSM). The results revealed that saturation magnetization (Ms) and coercivity (Hc) of La3+ substituted samples has decreased as compared to the Ni-Zn ferrite samples. Hence, the observed results affirm that the lanthanum ion substitution has greatly influenced the structural, morphology and magnetic properties of Ni-Zn ferrite nanoparticles.

Elaboration, Characterization, and Magnetic Properties of Ni0.5Zn0.5Fe2O4 Nanoparticles of High Purity Using Molten Salts Technique

“…For comparison in Table are presented the values of lattice parameters and crystallites sizes of Ni 0.5 Zn 0.5 Fe 2 O 4 ferrites produced by different methods, it is noted that the values obtained are comparable to those found by different methods, using as precursors commercial raw materials with high purity, therefore, as shown in Table , despite that we used a non‐standard raw materials, our results are in very good agreement with those obtained in the literature …”

Influence of rare earth ion substitutions on the structural, optical, transport, dielectric, and magnetic properties of superparamagnetic iron oxide nanoparticles

“…It can be observed from Fig.7 that, the value of s M for SPIONs is high as compared to the Dy 3+ :SPIONs and La 3+ :SPIONs. This means that, replacement of Fe 3+ ions from the octahedral sites by the RE 3+ (Dy 3+ and La 3+ ) ions [2,21,40] is leaded to decreasing the saturation magnetization of ferrites, which is similar to the reported results of RE doped ferrites [59][60][61][62][63][64]. The decrease in s M of RE:SPIONs may therefore appear to be the consequence of many factors: a decrease in long range magnetic ordering upon insertion of large RE 3+ ions into the Fe 3 O 4 matrix, an increase in magnetic anisotropy, a decrease of the Fe 3+ -Fe 3+ interactions due to the reduction in the concentration of Fe ions on the B-sites [8,65,66].…”

Influence of neodymium substitution on structural, magnetic and spectroscopic properties of Ni–Zn–Al nano-ferrites

“…Several studies were done with varying the doping cations (divalent or trivalent) 1,2 and synthesizing the desired compounds with different methods such as sol-gel, thermal combustion, co-precipitation [3][4][5][6] in order to ameliorate certain structural, magnetic or dielectric properties as required in scientic and technological domains.…”