Synthesis, characterization and magnetic investigation of Er-substituted electrospun NiFe₂O₄ nanofibers

Abstract

Erbium nickel-ferrite (NiErxFe2−xO4 where 0.00 ≤ x ≤ 0.05) nanofibers were prepared by a sol–gel electrospinning process utilizing polyvinylpyrrolidone (PVP) polymer (MW: 40.000). Nanofibers of as-electrospun nickel-ferrite with erbium substitution were calcinated in air at 700 °C for 6 h. After calcination, microscopy analysis indicated uneven nanofiber surfaces that were formed from grains. An increase in erbium concentration in the structure yielded an increase in the lattice parameters and the cell volume, but a decrease in the crystallite size. Elemental erbium, nickel, iron, and oxygen were present in the electrospun NiErxFe2−xO4 nanofibers with no impurities. The magnetic properties were examined via magnetization against magnetic field (M-H) measurements. The M-H curves of all prepared NiErxFe2−xO4 nanofibers were measured at two different temperatures; room temperature (T = 300 K) and low temperature (T = 10 K) throughout H of ±70 kOe. The values of Ms (saturation magnetization), Mr (remanence), Hc (coercivity), SQR = Mr/Ms (squareness ratio), and (magnetic moments) were determined. The prepared set of nanofibers showed soft ferrimagnetic behavior at both 300 and 10 K. At both measured temperatures Ms improved with increasing Er3+ concentration up to x = 0.02, then it decreased with further increase in the Er3+ content.

Morphology and magnetic properties of NiFe2O4 powders prepared in molten sodium chloride

“…The content of zinc in nickel zinc ferrites decreases with performance frequency increasing, and NiFe 2 O 4 is the ferrite with highest cutoff frequency in nickel zinc ferrites, which has larger saturation magnetization [1]. Investigations on structural and magnetic properties of In 3+ , Ce 4+ and Er 3+ doping NiFe 2 O 4 are carried out to improve performance of ferrite [2–4]. The eddy current loss plays an important role in soft magnetic materials which performance in high frequency, some method to cut down the eddy current loss should be introduced.…”

Physical properties of Pr-substituted Li/Ni ferrite magnetic materials at nanometric scale for its multifunctional applications in industries/environment and their cytotoxicity, lymphocyte studies as nanomedicine

“…At nanoscale, ferrite magnetic nanoparticles show a drastic change in properties than their bulk size. These interesting properties are due to various factors such as super-exchange interactions, unsatisfied bonds, crystal structure, etc., which have played a significant role in its varied applications in several areas of science, engineering, technology and medicine (Almessiere et al 2019a;Albetran et al 2020). Due to its significant applications in different electronic devices, magnetic tapes, and recorders, low core loss materials, photovoltaic cells, researchers nowadays shifted their study towards rare-earth-doped or substituted nanomaterials (Korkmaz et al 2019).…”

Catalytic and Photocatalytic Electrospun Nanofibers for Hydrogen Generation from Ammonia Borane Complex: A Review

“…Materials with all three dimensions outside the nanoscale range are called (3D) nanomaterials. (3D) nanomaterials include multinanowires and dispersion nanoparticles [21][22][23][24][25].…”

“…Figure23. Photocatalytic performance of TiO 2 NFs with and without Zn and Fe for AB hydrolysis reaction.…”