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Disorderly conduct in Bi2Ln2Ti3O12 Aurivillius phases (Ln = La, Pr, Nd, Sm).

Published online by Cambridge University Press:  11 February 2011

Neil C. Hyatt  and
Joseph A. Hriljac
Neil C. Hyatt
Affiliation:
Department of Engineering Materials, The University of Sheffield, Mappin Street, Sheffield, S1 3JD., UK.
Joseph A. Hriljac
Affiliation:
School of Chemical Sciences, The University of Birmingham, Edgbaston, Birmingham. B15 2TT., UK.
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Abstract

The synthesis and structure of triple layered Bi2Ln2Ti3O12 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 [Bi2O2]2+ fluorite and [Ln2Ti3O10]2- perovskite-type layers. A significant degree of cation disorder is present in the Bi2Ln2Ti3O12 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 Bi2Ln2Ti3O12 system is therefore significantly suppressed as the size of the lanthanide cation is reduced.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 755: Symposium DD – Solid-State Chemistry of Inorganic Materials IV , 2002 , DD8.4
Copyright
Copyright © Materials Research Society 2003

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