Structural behavior of the four-layer aurivillius-phase ferroelectrics SrBi4Ti4O15 and Bi5T i3FeO15

Hervoches, CH, Sneddon, A, Riggs, R, Kilcoyne, SH, Manuel, P and Lightfoot, P 2002, 'Structural behavior of the four-layer aurivillius-phase ferroelectrics SrBi4Ti4O15 and Bi5T i3FeO15' , Journal of Solid State Chemistry, 164 (2) , pp. 280-291.

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Abstract

Rietveld refinement of powder neutron diffraction data has been used to study the crystal structures of the four-layer Aurivillius-phase ferroelectrics Bi5Ti3FeO15 (at 251C) and SrBi4Ti4O15 (at a series of temperatures up to 8001C). At 251C both materials adopt the polar orthorhombic space group A21am, in common with two-layer analogues such as SrBi2- Ta2O9. At temperatures well above the ferroelectric Curie temperature (i.e., at temperatures of 6501C and above, with TcB5501C) SrBi4Ti4O15 transforms to the centrosymmetric tetragonal space group I4/mmm. However, there is good evidence from the raw diffraction data of a very subtle intermediate paraelectric orthorhombic phase, of Amam symmetry, in the region 55046501C. The distortion in the ferroelectric phase can be traced to displacements of the cations in the A site of the perovskite block, with cooperative tilting of the BO6 octahedra. The nature of the octahedral tilt system, cation disorder at the perovskite A and B sites, and the phase transition sequence in SrBi4Ti4O15, which parallels that found in SrBi2Ta2O9, are discussed.

Item Type:	Article
Themes:	Subjects / Themes > Q Science > QD Chemistry Subjects outside of the University Themes
Schools:	Schools > School of Computing, Science and Engineering Schools > School of Computing, Science and Engineering > Salford Innovation Research Centre
Journal or Publication Title:	Journal of Solid State Chemistry
Publisher:	Elsevier
Refereed:	Yes
ISSN:	0022-4596
Depositing User:	SH Kilcoyne
Date Deposited:	07 Oct 2010 09:36
Last Modified:	09 Aug 2017 01:19
URI:	http://usir.salford.ac.uk/id/eprint/10635

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