F152. Stepped superstructure in Bi8W2Nb2O23
Top: HRTEM image of Bi8W2Nb2O23, viewed down the [010] zone axis of a Bi2WO6-like subcell. The insets show a corresponding SAED pattern and a simulated image from a proposed model with 8 nm specimen thickness and 60 nm lens defocus. Bottom: Stepped superstructure in a zigzag arrangement. [W. Zhou, J. Solid State Chem., 163, 479-83 (2002)]. Also see [W. Zhou, Adv. Mater., 2, 94-7 (1990)].