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- Title
Significant improvement in the structural, microstructural, and room-temperature magnetic properties of Fe-doped NiO nanoparticles prepared by the solution combustion method.
- Authors
Sharma, Khem Raj; Negi, N. S.
- Abstract
Ni1−xFexO (x = 0, 0.02, 0.04, 0.06, 0.08, and 0.10) nanoparticles were prepared by solution combustion technique. The prepared samples were calcined at 600 °C for 2 h in air. A systematic analysis of structural, microstructural, magnetic, and optical properties has been carried out. Single-phase face-centered cubic structure is established in NiO nanoparticles with Fe doping up to 4% and further increasing the Fe concentration leads to the formation of a secondary phase. A significant reduction in average particle size is observed from 50 to 33 nm for undoped and 6 mol% Fe-doped NiO nanoparticles. The phase purity of the samples was confirmed by X-ray diffraction, fourier transform infrared spectroscopy, and Raman spectroscopy. The surface morphology of samples was examined by using field emission scanning electron microscope and high-resolution transmission electron microscope. The mixed-valence states of Ni (Ni2+/Ni3+) and Fe (Fe2+/Fe3+) were confirmed by X-ray photoelectron spectroscopy. The magnetic properties of prepared samples were carried out in powder as well as in pellet form by vibrating sample magnetometer at room temperature. Significant enhancement in the magnetic parameters is observed in the case of pellet samples due to compaction and densification of powder samples. This significant improvement in magnetic behavior is quite useful for various device applications. The optical absorption spectra of Fe-doped NiO nanoparticles exhibited a blue shift in peaks with increasing Fe content in the NiO host lattice.
- Subjects
FIELD emission electron microscopes; TRANSMISSION electron microscopes; MAGNETIC properties; POWDERS; DOPING agents (Chemistry); FOURIER transform infrared spectroscopy; MOSSBAUER spectroscopy
- Publication
Journal of Materials Science: Materials in Electronics, 2022, Vol 33, Issue 28, p22518
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-022-09031-w