Skip to the content

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.

[img] PDF - Published Version
Restricted to Repository staff only

Download (460kB) | Request a copy

    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: Colleges and Schools > College of Science & Technology
    Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering
    Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering > Materials & Physics 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 10:36
    Last Modified: 20 Aug 2013 17:29
    URI: http://usir.salford.ac.uk/id/eprint/10635

    Actions (login required)

    Edit record (repository staff only)

    Downloads per month over past year

    View more statistics