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Plate-shaped untwinned and twinned single crystals of the perovskite BiFeO 3  show different etch figures and etch figure arrangements on the surface when attacked with dilute nitric acid. These etch figures can be correlated with the orientation of the spontaneous polarization vector. With a view to correlating the direction of the polarization vector with the atomic positions in the crystal, the absolute configuration was determined from X-ray diffraction patterns at room temperature on a dendritic ferroelastic/ferroelectric asgrown single domain crystal. The typical etch figure arrangement close to the crystal edges was used as a reference system. The absolute structure shows that the part of the crystal corresponding to the positive end of the spontaneous polarization vector etches faster than the negative one.

The absolute configuration of an as-grown and a mechanically switched single crystal of the perovskite BiFeO 3