Title :
Structural and Magnetic Characterizations of Coprecipitated Ni–Zn and Mn–Zn Ferrite Nanoparticles
Author :
Rao, Parvatheeswara B. ; Kim, Chong-Oh ; Kim, CheolGi ; Dumitru, I. ; Spinu, L. ; Caltun, O.F.
Abstract :
Two mixed ferrite systems, namely Ni0.65Zn0.35 Fe2O4 (Ni-Zn) and Mn0.75 Zn0.18 Fe2.07 O4 (Mn-Zn) have been prepared by coprecipitation method, and then the resulting ultrafine powders were heat treated at different temperatures from 200 to 800degC for improved crystallinity and magnetic properties. The samples were characterized by X-ray diffraction, vibrating sample magnetometry, and ferromagnetic resonance spectrometry. As a result of the heat treatment, the average particle size has been found to increase from 9.9 to 15.7 nm for Ni-Zn ferrites and from 2.4 to 10.2 nm for Mn-Zn ferrites, and the corresponding magnetization values have increased from 9.1 to 23 emu/g for Ni-Zn ferrites and from 7.9 to 11.7 emu/g for Mn-Zn ferrites, respectively. The results are discussed in the light of changes in particle size and inversion degree parameter for cationic distribution at nanoscales
Keywords :
X-ray diffraction; coercive force; ferrites; magnetic materials; magnetic structure; magnetometers; manganese compounds; nanoparticles; nickel compounds; zinc compounds; 10.2 nm; 15.7 nm; 2.4 nm; 9.9 nm; X-ray diffraction; cationic distribution; coprecipitation; crystallinity; ferrite nanoparticles; ferromagnetic resonance spectrometry; heat treatment; magnetic characterizations; magnetic properties; particle size; structural characterizations; vibrating sample magnetometry; Crystallization; Ferrites; Iron; Magnetic properties; Magnetic resonance; Nanoparticles; Powders; Temperature; X-ray diffraction; Zinc; Coercivity; Ni–Zn and Mn–Zn ferrite nanoparticles; coprecipitation; ferromagnetic resonance linewidth and magnetic materials; magnetization;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2006.879901
