The Effect of Transition Metals Incorporation on the Structural and Magnetic Properties of Magnesium Oxide Nanoparticles

Abstract

Pure and doped magnesium oxide nanoparticles were successfully synthesized employing a sol-gel process. The synthesized nanoparticles were characterized by thermal differential analysis, X-ray powder diffraction, transmission electron microscopy, scanning electron microscope, energy-dispersive X-ray spectroscopy, and vibrating sample magnetometer. X-ray diffraction patterns confirmed the crystallization of MgO structure and correspondingly ratified that the transition metal atoms were incorporated into the MgO host lattice. The crystallite size decreases as the concentration of dopants were augmented. TEM images showed that the particles of pristine magnesium oxide were embedded in the sheet matrix of the graphene-like layer with a size of 22.06 nm. The EDS spectra revealed the presence of carbon in pure MgO nanoparticles, while nickel and chromium were distributed in the host lattice. Based on VSM measurements, room temperature ferromagnetism in pristine MgO-NPs could be ascribed to the presence of either Mg vacancy or carbon atoms. Furthermore, paramagnetic ordering had been observed upon doping. Overall, the prepared MgO-NPs may be found as a potential application in spintronics devices.

Magnetic, Optical and Phonon Properties of Ion-Doped MgO Nanoparticles. Application for Magnetic Hyperthermia

“…The saturation magnetism was found to be changed due to ion doping. The RTFM of MgO NPs doped with different ions, such as Pb, Zn, Mn, Ti, Cr, Fe, Ni, Al, Ag, Eu, La, etc., are observed experimentally by many authors [ 8 , 9 , 10 , 11 , 12 , 13 ]. The reported weak RTFM is mainly due to oxygen or Mg vacancies on the surface [ 7 , 10 , 14 ].…”

Structural and Magnetic Properties of Ni-doped Yttrium Iron Garnet (Y3Fe5-XNixO12) Nanopowders Synthesized by Self-Combustion Method

“…Increasing Ni concentration will increase the volume fraction of Ni 2+ ions. The super exchange interaction between these Ni 2+ ions is responsible for ferromagnetism 41,42,43,44 . Thus, the reduction of saturation and remanence magnetization in our samples are due to the enhanced antiferromagnetic interaction.…”