On the crystal structures of La2Ti2O7 and La5Ti5O17: High-resolution electron microscopy

Tim Williams, Helmut Schmalle, Armin Reller, Frank Lichtenberg, Daniel Widmer, Georg Bednorz

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The structure of La5Ti5O17 has been examined by high-resolution transmission electron microscopy combined with powder X-ray and thermogravimetric analysis. It comprises five [TiO6] octahedra-thick layers isomorphous with {1 0 0} slabs of the LaTiO3 orthorhombic perovskite structure, bounded by crystallographic shear parallel with the perovskite [0 0 1] direction. La atoms occupy the distorted perovskitic A sites. The structure is derived from the homologous La2Ti2O7 by elimination of 1 35 of the oxygens from this four-octahedra-thick layered structure. Both compounds are members of an homologous series based on variation in the anion to cation ratio.

Original languageEnglish
Pages (from-to)534-548
Number of pages15
JournalJournal of Solid State Chemistry
Issue number2
Publication statusPublished - 1 Jan 1991
Externally publishedYes

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