
The coordination-polyhedron of A-site cation of the A B \mathrm{O}_{3} perovskite; (a) ideal 12-fold coordination (cubo-octahedron), (b) example of 12-fold coordination of a distorted perovskite (yellow bonds larger than the rest), and (c) more suitable 8 -fold coordination for (b) example.
auto-cropped from the OCR Markdown crop box (stage B); materials and kind to be reviewed in Phase 1