A series of Mg-doped NiFe2O4 (NMF) and Co-doped NiFe2O4 (NCF) nanoparticles were synthesized via citrate-gel method. The X-ray diffraction patterns of conventionally heated NMF and NCF nanoparticles confirmed the formation of single-phase cubic spinel structures. Further, the variation of structural parameters as a function of compositions was described. The morphology of NMF and NCF materials was investigated using scanning and transmission electron microscopes (SEM and TEM). In addition, the formation of tetrahedral (A-site) and octahedral (B-site) locations of NMF and NCF was obtained from the Fourier transform infrared spectra (FTIR). Furthermore, the room- and low-temperature magnetic properties were studied for NMF and NCF nanoparticles using magnetization versus magnetic field (M-H) loops and zero field cooled (ZFC) and field cooled (FC) curves, respectively. The results revealed that NMF and NCF nanoparticles exhibited superparamagnetic (SPM) nature at room temperature.
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The authors (AG and DR) are very grateful to Prof. G. Prasad, Head, Department of Physics, Osmania University, Hyderabad, and also thankful to UPE-UGC-OU and DST-PURSE-OU. Authors K. M. Batoo, S. F. Adil and M. Khan are thankful to the Deanship of Scientific Research at King Saud University for its funding through the Research Group Project no. RG-1437-030.
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Gaffoor, A., Naidu, K.C.B., Ravinder, D. et al. Synthesis of nano-NiXFe2O4 (X = Mg/Co) by citrate-gel method: structural, morphological and low-temperature magnetic properties. Appl. Phys. A 126, 39 (2020). https://doi.org/10.1007/s00339-019-3225-1