Structural and electrical properties of La³⁺ ions substituted MnFe₂O₄ ferrite nanoparticles synthesized via cost-effective reverse micelles strategy

Abstract

La3+ ions substituted manganese ferrite (MnFe2-x La x O4) nanoparticles via reverse micelles strategy were synthesized and their structural and electrical properties are discussed in this article. Using low-cost precursors, mono-dispersed, and well crystalline MnFe2-x La x O4 nanoparticles were prepared at low temperature. X-ray diffraction (XRD) explored cubic spinel structure with minute secondary phase as LaFeO3. The crystallite size of MnFe2-x La x O4 was found to increase from 12.82 nm to 15.95 nm with increased La3+ ions contents. The room temperature Fourier transform infrared (FTIR) spectra were recorded in the wavenumber range 1000–400 cm−1 that showed the vibrational bands of octahedral and tetrahedral complexes. These bands are the fingerprints of spinel ferrites. Surface morphology characterized by field emission scanning electron microscopy (FESEM) revealed the relative spherical morphology of prepared spinel ferrite particles. The elemental composition analysis from Energy-dispersive x-ray (EDX) spectroscopy confirmed the presence of expected elements in the samples. The modification in resistivity and the enhancement in the dielectric parameters suggested the possible utilization of these soft ferrite nanoparticles in advanced electronics, especially the devices that are required to operate at high frequencies.

Impact of Process Parameters and Dopant Concentration on Structural, Magnetic, and Dielectric Properties of Dysprosium-doped Nickel-Zinc Ferrites Synthesized by Microwave Hydrothermal Method

“…The secondary orthoferrite phase formation in ferrites is observed by other researchers once the solubility limit of rare Earth ions exceeds. [37][38][39] Figure 6 shows the FESEM patterns of all Dy 3+ substituted Ni-Zn synthesized powders and it is observed that the prepared powders have shown spherical morphology with some agglomeration. The particle size was measured using linear intercept by taking the average of three different places and the obtained values are depicted in Table II.…”

Effect of the Substitution of Co by Ni on the Crystal Structure and Magnetic Properties of Cobalt Ferrite Nanoparticles

“…Therefore, it is important to make a good selection of the appropriate synthesis method according to the desired properties and applications. Various methods have been used for the synthesis of ferrite nanoparticles, such as: coprecipitation [14], sol-gel [15], autocombustion [16], hydrothermal synthesis [17], microemulsion [18], reverse micelles [19]. Chemical coprecipitation has proven to be a simple, fast, and low-cost synthesis method that allows obtaining nanoparticulate powders [20].…”