Title :
Hyperfine interactions and magnetic properties of nanosized powders of magnetite
Author :
Yuryev, S. ; Yushchuk, S. ; Tsiupko, F. ; Dubelt, S. ; Loboiko, V.
Author_Institution :
Dept. of Phys., Nat. Univ. Lviv Polytech., Lviv, Ukraine
Abstract :
The fine powder of magnetite Fe3O4 was obtained by precipitation of aqueous solutions of chemically pure Mohr´s salt Fe(NH4)2(SO4)2·6H2O and FeCl3 using concentrated NH4OH. The fine powders with the particle size from 5 to 25 nm were obtained. Some portions of powders were subjected to heat treatment in air at temperatures of 473, 573 and 673 K. This annealing leads to the formation of γ-Fe2O3. The parameters of hyperfine interactions for these ions in the crystal structure of Fe3O4 and γ-Fe2O3 by the nuclear gamma-resonance method (NGR) were obtained and difference in occupations of iron ions in octa- and tetra-sublattice compared to stoichiometric magnetite was revealed.
Keywords :
annealing; crystal structure; hyperfine interactions; iron compounds; nanoparticles; particle size; precipitation; Fe3O4; Mohr´s salt; annealing; crystal structure; heat treatment; hyperfine interaction; magnetite; nanosized powders; nuclear gamma resonance method; particle size; precipitation; temperature 473 K; temperature 573 K; temperature 673 K; Annealing; Heating; Magnetic resonance; magnetite; nano-powder ferrite; nuclear gamma resonance;
Conference_Titel :
Oxide Materials for Electronic Engineering (OMEE), 2014 IEEE International Conference on
Conference_Location :
Lviv
Print_ISBN :
978-1-4799-5960-0
DOI :
10.1109/OMEE.2014.6912351
