Affiliations: Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba 305-0801, Japan | Departemen Kimia, Institut Teknologi Bandung, Jl. Ganesa 10 Bandung 40132, Indonesia | The Centre for Heavy Metals Research, School of Chemistry, The University of Sydney, Sydney 2006, NSW, Australia
Note: [] Corresponding author. Address: Departemen Kimia, Institut Teknologi Bandung, Jalan Fanesa 10 Bandung 40132, Indonesia. E-mail: [email protected]
Abstract: The room temperature structures of the five layer Aurivillius phases A2Bi4Ti5O18 (A = Ca, Sr, Ba and Pb) have been refined from powder neutron diffraction data using the Rietveld method. The structures consist of [Bi2O2]2+ layers interleaved with perovskite-like [A2Bi2Ti5O16]2− blocks. The oxides were found to be orthorhombic (space group B2cb) as a consequence of tilting of the TiO6 octahedra coupled with cation displacement. The tilting is a consequence of the mismatch between the Bi2O2 and perovskite-like layers.
