Disorderly conduct in Bi2Ln2Ti3O 12 Aurivillius phases (Ln = La, Pr, Nd, Sm)

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  • Sheffield University
  • School of Chemical Sciences


The synthesis and structure of triple layered Bi2Ln 2Ti3O12 Aurivillius phases, prepared from K2Ln2Ti3O10 Ruddlesden - Popper precursors has been investigated. In structural terms, these materials may be considered as being composed of a regular intergrowth of [Bi2O 2]2+ fluorite and [Ln2Ti3O 10]2 perovskite-type layers. A significant degree of cation disorder is present in the Bi2Ln2Ti 3O12 system, involving the cross substitution of Ln / Bi cations onto the Bi / Ln sites in the fluorite and perovskite-type layers, respectively. Bi / Ln disorder destabilises the presence of the Ln cation in the perovskite-type layer as the size mismatch of the Bi / Ln cations increases. Cation disorder in the Bi2Ln2Ti3O 12 system is therefore significantly suppressed as the size of the lanthanide cation is reduced.


Original languageEnglish
Pages (from-to)335-340
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Publication statusPublished - 10 Nov 2003
EventSolid-State Chemistry of Inorganic Materials IV - Boston, MA, United States
Duration: 2 Dec 20026 Dec 2002