抄録
Bi2WO6 crystallizes in Aurivillius-type structure with P21ab space group. W in WO6 octahedron is located at off-centric position and the octahedron is tilting and rotating inside the aristotype structure. Lone-pair effect of Bi3+, which pushes off two of eight ligand ions (oxide ions) in its aristotype structure, and this repulsion caused kinked O-W-O bonding and ferroelectricity of the crystal.
