Influence of Electron Delocalization on the Magnetic Properties of Iron Ludwigite Fe3O2BO3

The crystal structure of ludwigite from Vranovac ore deposit (Boranja Mt., Serbia) was refined using the X‐ray powder diffraction (XRPD) Rietveld method in the space group Pbam to a final RB=7.45% and RF=5.26%. It has the unit cell dimensions of: a= 9.2515(2) Å; b= 12.3109(2) Å; c= 3.03712 (7) Å; and V= 345.91(1) Å3. The calculated distances and angles are mostly in good agreement with the Mg2+‐Fe2+ substitutions across the M(1) and M(3) sites, as well as with the Fe3+‐Al3+ replacement in the M(4) site. However, the mean observed M(2)‐O distance is considerably shorter than prescribed, due to a slight increase of the Fe3+ content in the M(2) site. Such replacement was compensated by slight increase of the Fe2+ content in the M(4) site, resulting in the (Mg1.48Fe2+0.46Fe3+0.05Mn0.02)2.01 (Fe3+0.94Fe2+0.04Al0.02)1.00B1.00O5 composition. The formation temperature was estimated to be about 500–600°C. The influences of the various chemical compositions to the crystallographic parameters, M‐O distances, M(3) and M(4) sites shift, distortion parameters and estimated valences, were also studied and compared with other reference samples.

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Identification of local magnetic contributions in a Co2FeBO5 single crystal by XMCD spectroscopy

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Kazak

et al. 2013

Jetp Lett.

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Influence of Electron Delocalization on the Magnetic Properties of Iron Ludwigite Fe3O2BO3

Abstract: 57 Fe Mössbauer spectroscopic studies of iron ludwigite Fe 3 O 2 BO 3 performed between 4 and 450 K allow the discussion of magnetic spin arrangements and the dynamics of electronic configurations of iron. The observed magnetic transitions are related to charge ordering.

Cited by 6 publications

References 14 publications

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Crystal Structure and Chemical Composition of Ludwigite from Vranovac Ore Deposit (Boranja Mountain, Serbia)

Identification of local magnetic contributions in a Co2FeBO5 single crystal by XMCD spectroscopy

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