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Observed (crosses), calculated (solid line), and difference patterns from Rietveld refinement of powder neutron diffraction data (, GEM, ISIS) from at room temperature. Tick marks denote main phase reflections. Vanadium peaks (from sample container) in the region of have been excluded. Inset shows Rietveld refinement of powder x-ray diffraction data (station 9.1, SRS).
Structure of viewed along the  direction. Displacements of the Bi and site disordered Fe/Cr site cations from their ideal positions along the threefold symmetric direction of the hexagonal axis (equivalent to the  direction of the pseudocubic cell) are indicated by arrows.
Mössbauer spectrum for at (top) and (bottom). The lack of magnetic ordering at room temperature is shown by the spectrum, which is fitted to a doublet profile characteristic of a paramagnetic material. This is contrasted with clear magnetic order or freezing at temperatures below the susceptibility maximum shown in Fig. 4(b), as demonstrated by the spectrum, which is fitted to a six line magnetic profile.
(a) Comparison of magnetization isotherms at for two samples with differing magnetic impurity content. (b) Differential high field susceptibility measurement reveals an antiferromagnetic-like transition at . The dashed line shows the Curie-Weiss fit.
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