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A new chiral phase of ferric ions in bismuth ferrite, the only material knownto support multiferroic behaviour at room temperature, is inferred fromextensive sets of data gathered by resonant x-ray Bragg diffraction. Values ofall ferric multipoles participating in a minimal model of Fe electronicstructure are deduced from azimuthal-angle scans. Extensive sets ofazimuthal-angle data, gathered by resonant x-ray Bragg diffraction, yieldvalues of all ferric multipoles participating in a minimal model of Feelectronic structure. Paramagnetic (700 K) and magnetically ordered (300 K)phases of a single crystal of BiFeO3 have been studied with x-rays tuned nearto the iron K-edge (7.1135 keV). At both temperatures, intensities at a Braggspot forbidden in the nominal space-group, R3c, are consistent with a chiralmotif of ferric ions in a circular cycloid propagating along (1, 1, 0)H.Templeton and Templeton scattering at 700 K is attributed in part tocharge-like quadrupoles in a cycloid. The contribution is not present in astandard, simplified model of electronic states of the resonant ion withtrivial cylindrical symmetry.

Chiral properties of bismuth ferrite (BiFeO3) inferred from resonant x-ray Bragg diffraction