Figure 3 Fraction of the structure of Nd2W2O9 with atomic numbering scheme (projection approximately along the a-axis). Coordination polyhedra are indicated as a guide for the eye. Atoms are drawn as 50% probability ellipsoids. (Symmetry codes: (iii) -x + 1, -y + 1, -z; (vii) x, -y + , z + ; (ix) -x, -y + 1, -z; (x) -x + 1, y - , -z + ; (xi) -x, y - , -z + ; (xiv) x, -y + , z - ; (xv) x, y, z + 1; (xvi) -x, -y + 1, -z + 1).