title: Modulated structure of Ag2SnO3 studied by high-resolution electron microscopy
abstract: The modulated structure of Ag2SnO3, disilver tin trioxide, was investigated by high-resolution electron microscopy and electron diffraction along four different directions. Electron diffraction showed an incommensurate one-dimensional modulated structure with a modulation wavevector of 1/6.4a*. High-resolution images showed a large number of superstructure domains with the size range 10-100 nm and orientations related by hexagonal rotation. The modulation was determined to be displacements along the c axis of the Ag atoms both in octahedral and linear coordination. An approximate structure model with a commensurate sixfold superstructure, with an orthorhombic cell (P2(1)2(1)2(1), a = 2.922, b = 1.267, c = 0.562 nm), is proposed. Calculated images and electron diffraction patterns, based on this model, agree well with experimental observations.
authors.affiliation: National Center for HREM, Inorganic Chemistry 2, Chemical Center, Lund University, Sweden.
authors.initials: T
authors.lastname: Oku
authors.initials: A
authors.lastname: Carlsson
authors.initials: JO
authors.lastname: Bovin
authors.initials: C
authors.lastname: Svensson
authors.initials: LR
authors.lastname: Wallenberg
authors.initials: C
authors.lastname: Linke
authors.initials: M
authors.lastname: Jansen