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Magnetic hysteresis properties, Mossbauer spectra and structural data of spherical 250 nm particles of solid solutions Fe3O4-gamma-Fe2O3

Schmidbauer, E., and M. Keller (2006), Magnetic hysteresis properties, Mossbauer spectra and structural data of spherical 250 nm particles of solid solutions Fe3O4-gamma-Fe2O3, Journal of Magnetism and Magnetic Materials, 297(2), 107-117, doi:10.1016/j.jmmm.2005.02.063.

Abstract
Magnetic hysteresis, Fe-57 Mossbauer and X-ray data are presented for spherical 250 nm particles of solid solutions in the spinel system Fe3O4-gamma-Fe2O3 (Fe(3-u)square(u)O(4), 0 <= 1/3 (square =cation vacancy)). For dispersed particles, the composition of u similar to 0.24 exhibits maxima of coercive force H(c)similar to 25kA/m, relative saturation remanence sigma(rs)/sigma(s)similar to 0.3, switching field distribution H-SFD similar to 100 kA/m and of anhysteretic remanence susceptibility at room temperature. The experimental results point to single domain particles with non-homogeneous magnetization mode or to a magnetization mode intermediate between single domain and two domain particles. The maxima are probably a consequence of the superposed action of (i) Fe2+-single ion anisotropy and (ii) microstresses. Mossbauer spectra were used to analyse the cation distribution on A- and B-sites of the spinel lattice. The experimental data were found to disagree with the cation distribution according to a formula used in the literature for Mossbauer analysis. From X-ray diffractograms, lattice parameters a(0) and intensity of superstructure reflections, due to ordering of square in the spinel lattice, were determined as a function of the 0 concentration it. The reflections are in agreement with a tetragonal cell with c(0)/a(0) = 3 which has been frequently observed for gamma-Fe2O3 (u = 1/3) in the literature.
BibTeX
@article{id128,
  author = {E. Schmidbauer and M. Keller},
  journal = {Journal of Magnetism and Magnetic Materials},
  number = {2},
  pages = {107-117},
  title = {{Magnetic hysteresis properties, Mossbauer spectra and structural data of spherical 250 nm particles of solid solutions Fe3O4-gamma-Fe2O3}},
  volume = {297},
  year = {2006},
  language = {en},
  doi = {10.1016/j.jmmm.2005.02.063},
}
EndNote
%0 Journal Article
%A Schmidbauer, E.
%A Keller, M.
%D 2006
%N 2
%V 297
%J Journal of Magnetism and Magnetic Materials
%P 107-117
%T Magnetic hysteresis properties, Mossbauer spectra and structural data of spherical 250 nm particles of solid solutions Fe3O4-gamma-Fe2O3
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Printed 20. Aug 2019 17:59