This analysis shows enhanced bandgap energy and magnetic properties in rare-Earth doped nickel cobalt ferrites, indicating potential for multifunctional applications.
In this study, rare-Earth-doped nickel cobalt ferrites (NCFO) with the compositional formula Ni 0.5 Co 0.5 Fe 0.95 R 0.05 O 4 (where R = Pr, Sm and Ho) were synthesized through the solid-state reaction method. X-ray diffraction patterns confirmed the existence of an orthorhombic impurity phase in each of the doped samples. NCFO-Pr sample exhibited the maximum crystallite size of 78.8 nm, indicating enhanced grain growth due Pr substitution. UV–vis spectra indicated an increase in bandgap energy upon doping, with values ranging from 2.58 eV to 2.64 eV. FTIR study of NCFO and doped samples showed significant changes in Fe-O and Co-O stretching bands, broadened absorption peaks, and variations in the 1000–1500 cm −1 . The modes at 467–474 cm −1 shifted to lower wavenumbers (474, 468, and 467 cm −1 ) corresponding to the bending vibrations of Fe-O bonds inside octahedral sites. Magnetic hysteresis measurements showed the coercivity values of Ho, Pr and Sm doped compounds are 788, 504 and 386 Oe respectively. Magneto crystalline anisotropy constants varied significantly across dopants. These findings demonstrate the effectiveness of rare-Earth doping in tailoring structural, optical and magnetic properties of Ni-Co spinel ferrite systems for potential multifunctional device applications.
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Rani et al. (2025) studied this question.
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