B-site cations in (1- x)BaTiO 3– xBiScO 3 and (1- x)PbTiO 3– xBiScO 3 using X-ray absorption spectroscopy]]>

摘要

The structural properties of (1-x)BaTiO3–xBiScO3and (1-x)PbTiO3–xBiScO3were investigated using powder X-ray diffraction and X-ray absorption spectroscopy. Diffraction measurements confirmed that substituting small amounts of BiScO3into BaTiO3initially stabilizes a cubic phase atx?=?0.2 before impurity phases begin to form atx?=?0.5. BiScO3substitution also resulted in noticeable changes in the local coordination environment of Ti4+. X-ray absorption near-edge spectroscopy (XANES) analysis showed that replacing Ti4+with Sc3+results in an increase in the off-centre displacement of Ti4+cations. Surprisingly, BiScO3substitution has no effect on the displacement of the Ti4+cation in the (1-x)PbTiO3–xBiScO3solid solution.