Abstract
Cubic structured nickel-zinc ferrite nanoparticles (Ni0.25Zn0.75Fe2O4) have been synthesized by thermal treatment method. In this procedure, an aqueous solution containing metal nitrates as precursors, polyvinyl pyrrolidone as a capping agent, and deionized water as a solvent were thoroughly stirred, dried at 353 K for 24 h, and crushed into powder before calcination to remove organic matters and crystallize the particles. The structure and particle size were characterized by X-ray powder diffraction and transmission electron microscopy. The average particle size increased from 7 to 25 nm with increase of calcination temperature from 723 to 873 K respectively. The magnetic properties were determined by vibrating sample magnetometer and electron paramagnetic resonance electron paramagnetic resonance at room temperature. By increasing the calcinations temperatures from 723 to 873 K it showed an increase of the magnetization saturation from 11 to 26 emu/g and the g-factor from 2.0670 to 2.1220. The Fourier transform infrared spectroscopy was used to confirm the presence of metal oxide bands at all temperatures and the removal of organic matters at 873 K.
Highlights
The last two decades have seen a remarkable progress in the synthesis of spinel ferrites nanocrystals, aiming at a better material with excellent chemical stability, low magnetic coercivity, moderate saturation magnetization, high permeability, high electrical resistivity and low eddy current
Zn ferrite bulk material has a normal spinel structure, where all divalent cations are located on the tetrahedral sites and trivalent cations all located on the octahedral sites
The brown solid material was crushed into powder and the samples were heated for 3 hours in alumina boat at different calcination temperatures of 723, 773, 823 and 873 K to decompose the organic matters and crystallize the nanoparticles
Summary
The last two decades have seen a remarkable progress in the synthesis of spinel ferrites nanocrystals, aiming at a better material with excellent chemical stability, low magnetic coercivity, moderate saturation magnetization, high permeability, high electrical resistivity and low eddy current. The magnetic properties of ferrites of spinel structural formula AB2O4 are mainly controlled by the divalent cations, which occupy the tetrahedral A sites and the trivalent cation, which has high degree affinity for octahedral B sites [3,4]. Zn ferrite bulk material has a normal spinel structure, where all divalent cations are located on the tetrahedral sites and. Ni ferrites bulk materials on the other hand have an inverse spinel structure, where half of trivalent cations occupy the tetrahedral sites while the other half remain on octahedral, while divalent cations all migrate to octahedral positions. No other chemicals were added, this method offers the advantages of simplicity, low reaction temperatures, a low cost, and an environmentally friendly operation since it produces no by-product effluents [17,18,19,20]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
