TY - JOUR
T1 - Surface and bulk cation distribution of the spinel system ZnxMg1-xFe2O4
AU - Nava, N.
AU - Jacobs, J. P.
AU - García, A.
AU - Rosink, J. J.W.M.
AU - Valenzuela, M. A.
AU - Van Ijzendoorn, L. J.
AU - Brongersma, H. H.
PY - 1996/4/10
Y1 - 1996/4/10
N2 - ZnxMg1-xFe2O4 mixed oxide spinels (x = 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0) were prepared by conventional solid state reaction method. Bulk and surface characterization of these ferrites were carried out by different techniques. The ratios Zn/Fe and Mg/Fe determined by PIXE and AAS were nearly as expected from the synthesis mixture, i.e. following the substitution model. XRD shows only a spinel structure (fcc) with increasing lattice parameter as x increases from 0 to 1. The bulk ratios of tetrahedral to octahedral sites occupied by Fe cations measured by NGR are in good agreement with the theoretical bulk stoichiometry. LEIS results indicate a Mg substitution by Fe cations at the surface. Only octahedral sites are proposed at the surface. The transition from inverse to normal spinel was follow through NGR-spectra occurring at x = 0.4.
AB - ZnxMg1-xFe2O4 mixed oxide spinels (x = 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0) were prepared by conventional solid state reaction method. Bulk and surface characterization of these ferrites were carried out by different techniques. The ratios Zn/Fe and Mg/Fe determined by PIXE and AAS were nearly as expected from the synthesis mixture, i.e. following the substitution model. XRD shows only a spinel structure (fcc) with increasing lattice parameter as x increases from 0 to 1. The bulk ratios of tetrahedral to octahedral sites occupied by Fe cations measured by NGR are in good agreement with the theoretical bulk stoichiometry. LEIS results indicate a Mg substitution by Fe cations at the surface. Only octahedral sites are proposed at the surface. The transition from inverse to normal spinel was follow through NGR-spectra occurring at x = 0.4.
UR - http://www.scopus.com/inward/record.url?scp=0029950674&partnerID=8YFLogxK
U2 - 10.1007/BF02163288
DO - 10.1007/BF02163288
M3 - Artículo
SN - 0236-5731
VL - 212
SP - 431
EP - 443
JO - Journal of Radioanalytical and Nuclear Chemistry Letters
JF - Journal of Radioanalytical and Nuclear Chemistry Letters
IS - 6
ER -