Rubidium sodotricadmate, Rb[NaCd₃O₄]

Abstract

Rb[NaCd3O4] presents, to the best of our knowledge, the first example of a 4d transition metal oxide in this A[(MO)4] structure type. The structure consists of a three-dimensional network of edge- and corner-linked distorted tetra­hedral [MO4] entities, with M = Na+ and Cd2+ in a 1:3 ratio sharing a common site set on Wyckoff position 8h in space group I4/m. The large cavities are occupied by A = Rb+ in an almost cubic coordination (4/m symmetry), giving rise to one-dimensional chains of face-sharing [RbO8] polyhedra along [001].