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Figure 3 Coordination polyhedron of Rb in the paraelectric room temperature phase of RDA. Rb and O are represented by purple and red ellipsoids drawn at 75% probability level. Symmetry codes: (i) −x, −y, z; (ii) y, −x, −z + 1; (iii) −y, x, −z + 1; (iv) −x + , y, −z + ; (v) x − , −y, −z + ; (vi) −y, −x + , z + ; (vii) y, x − , z + |