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

fYear

2014

fDate

26-30 May 2014

Firstpage

85

Lastpage

86

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Oxide Materials for Electronic Engineering (OMEE), 2014 IEEE International Conference on

Conference_Location

Lviv

Print_ISBN

978-1-4799-5960-0

Type

conf

DOI

10.1109/OMEE.2014.6912351

Filename

6912351