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Structure of nanocrystalline MgFe 2 O 4 from X-ray diffraction, Rietveld and atomic pair distribution function analysis

2005; Wiley; Volume: 38; Issue: 5 Linguagem: Inglês

10.1107/s0021889805024477

1600-5767

Milen Gateshki, Valeri Petkov, S.K. Pradhan, Thomas Vogt,

Iron oxide chemistry and applications

The three-dimensional structure of nanocrystalline magnesium ferrite, MgFe 2 O 4 , prepared by ball milling, has been determined using synchrotron radiation powder diffraction and employing both Rietveld and atomic pair distribution function (PDF) analysis. The nanocrystalline ferrite exhibits a very limited structural coherence length and a high degree of structural disorder. Nevertheless, the nanoferrite possesses a very well defined local atomic ordering that may be described in terms of a spinel-type structure with Mg 2+ and Fe 3+ ions almost randomly distributed over its tetrahedral and octahedral sites. The new structural information helps explain the material's unusual magnetic properties.