Investigation of local structure around Fe and Mn in barium titanate single crystals by X-ray fluorescence holography

Fe (Mn)-doped BaTiO3 single crystals show an efficient photovoltaic (PV) effect assisted by “successive-redox” under visible light irradiation. The doped Fe (Mn) ion is supposed to be coupled with a neighbor O vacancy. To confirm such a Fe (Mn)-VO complex, we will measure Fe (Mn) X-ray fluorescence holograms and obtain a detailed picture of the local structures around Fe (Mn) by the reconstruction of 3D atomic images. The setup for this experiment is well established, and we have enough experiences of the experiment at D2AM in ESRF.