Crystal structure and ionic conductivity of a new bismuth tungstate, Bi3W2O10×5

The compound Bi3W2O105 was synthesized by the solid-state technique from Bi2O3 and WO3 in stoichiometric quantities. Single crystals were grown by the melt-cooling technique and the crystal structure was solved in the tetragonal I4/m space group with a = 3,839 (1) Å, c = 16,382 (5) Å, V = 241,4 (1) Å3, Z = 4 and was refined to an R index of 0,0672. The structure represents a modification of the Aurivillius phase and consists of [Bi2O2]2+ units separated by WO8 polyhedra. a.c. impedance studies indicate oxide ion conductivity of 2,91 10^-5–5 Scm–1 at 600C.