Crystal structure and ionic conductivity of a new bismuth tungstate, Bi 3W 2O 10·5

Abstract

The compound Bi 3W 2O 10·5 was synthesized by the solid-state technique from Bi 2O 3 and WO 3 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) Å 3, Z = 4 and was refined to an R index of 0·0672. The structure represents a modification of the Aurivillius phase and consists of [Bi 2O 2] 2+ units separated by WO 8 polyhedra. a.c. impedance studies indicate oxide ion conductivity of 2·91 10 -5 Scm -1 at 600°C. © Indian Academy of Sciences.