Title: Structural studies by high-resolution electron microscopy: intergrowth of ReO<sub>3</sub> and tetragonal tungsten bronze-type structures in the system Nb<sub>2</sub>O<sub>5</sub>–WO<sub>3</sub>
Abstract: With high-resolution electron microscopy new crystal structures were found in the binary system of Nb 2 O 5 WO 3 oxides. The compounds are proposed to have the mole ratios 4Nb 2 O 5 . 22WO 3 and 4Nb 2 O 5 . 50WO 3 . The crystal structures are ascribed to intimate intergrowths of two known structures, the ReO 3 type and tetragonal tungsten bronze type. The latter grows coherently in the host lattice of the former, forming regularly arranged slabs. The coherent intergrowth of the tetragonal tungsten bronze structures is described as the 'rotation operation' on the ReO 3 -type structure.