XANES STUDY AND RIETVELD REFINEMENT FOR THE NANOMETER-SIZED POLYCRYSTALLINE FERRITE, AFE(12)O(19) (A=SR, BA)

Authors
CHOY JH SONG SW HAN YS
Citation
Jh. Choy et al., XANES STUDY AND RIETVELD REFINEMENT FOR THE NANOMETER-SIZED POLYCRYSTALLINE FERRITE, AFE(12)O(19) (A=SR, BA), Synthetic metals, 71(1-3), 1995, pp. 2057-2058
Citations number
7
Categorie Soggetti
Physics, Condensed Matter","Metallurgy & Metallurigical Engineering
Journal title
Synthetic metals → ACNP
ISSN journal
03796779
Volume
71
Issue
1-3
Year of publication
1995
Pages
2057 - 2058
Database
ISI
SICI code
0379-6779(1995)71:1-3<2057:XSARRF>2.0.ZU;2-3
Abstract
X-ray absorption near edge structure and Rietveld refinement were perf ormed in order to investigate the structural feature and the magnetic origin of magnetoplumbite type nanometer sized (congruent to 50nm) fer rite. The increase of covalency or the presence of higher oxidation st ate (Fe4+) could not be observed in XANES. According to the Rietveld r efinement, the Sr-ferrite has shorter bond distances because of the di fference in ionic size. The larger magnetic value (H-c=6500 Oe) of Sr- ferrite might be due to the reduced Fe-O bond distance which leads to a stronger ferromagnetic coupling between the Fe3+ ions in the lattice .