The effect of Sn for Ti substitution on the average and local crystal structure of BaTi_1−xSn_xO₃ (0 ≤ x ≤ 0.20)

The effect of Sn for Ti substitution on the room-temperature crystal structure of a series of perovskite-like barium titanate stannate compounds was investigated. The results of detailed X-ray powder diffraction, high-resolution transmission electron microscopy and selected-area electron diffraction analyses indicate that, on the long-range scale, a gradual increase of the Sn content provokes the transformation of the crystal structure from tetragonal to cubic, while Raman spectroscopy results reveal a lower local ordering than the average symmetry.