Show simple item record

dc.creatorAntić, Bratislav
dc.creatorPerović, Marija M.
dc.creatorKremenović, Aleksandar S.
dc.creatorBlanuša, Jovan
dc.creatorSpasojević, Vojislav
dc.creatorVulic, Predrag
dc.creatorBessais, Lotfi
dc.creatorBozin, Emil S.
dc.identifier.issn0953-8984 (print)
dc.identifier.issn1361-648X (electronic)
dc.description.abstractThe evolution of the magnetic state, crystal structure and microstructure parameters of nanocrystalline zinc-ferrite, tuned by thermal annealing of similar to 4 nm nanoparticles, was systematically studied by complementary characterization methods. Structural analysis of neutron and synchrotron x-ray radiation data revealed a mixed cation distribution in the nanoparticle samples, with the degree of inversion systematically decreasing from 0.25 in an as-prepared nanocrystalline sample to a non-inverted spinel structure with a normal cation distribution in the bulk counterpart. The results of DC magnetization and Mossbauer spectroscopy experiments indicated a superparamagnetic relaxation in similar to 4 nm nanoparticles, albeit with different freezing temperatures T-f of 27.5 K and 46 K, respectively. The quadrupole splitting parameter decreases with the annealing temperature due to cation redistribution between the tetrahedral and octahedral sites of the spinel structure and the associated defects. DC magnetization measurements indicated the existence of significant interparticle interactions among nanoparticles (superspins). Additional confirmation for the presence of interparticle interactions was found from the fit of the Tf(H) dependence to the AT line, from which a value of the anisotropy constant of K-eff = 5.6 x 10(5) erg cm(-3) was deduced. Further evidence for strong interparticle interactions was found from AC susceptibility measurements, where the frequency dependence of the freezing temperature T-f(f) was satisfactory described by both Vogel-Fulcher and dynamic scaling theory, both applicable for interacting systems. The parameters obtained from these fits suggest collective freezing of magnetic moments at T-f.en
dc.relationinfo:eu-repo/grantAgreement/MESTD/Integrated and Interdisciplinary Research (IIR or III)/45015/RS//
dc.relationUS DOE [DE-AC02-98CH10886, DE-AC02-06CH11357], LANSCE at Los Alamos National Laboratory [DEAC52-06NA25396]
dc.sourceJournal of Physics: Condensed Matteren
dc.titleAn integrated study of thermal treatment effects on the microstructure and magnetic properties of Zn-ferrite nanoparticlesen
dcterms.abstractAнтић Братислав; Спасојевић Војислав; Блануша Јован; Бессаис, Лотфи; Вулиц, Предраг; Перовић Марија; Кременовић Aлександар С; Бозин, Емил С.;
dc.citation.otherArticle Number: 086001

Files in this item


There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record