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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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.
|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 (SIRC)
|Journal or Publication Title:||Journal of Solid State Chemistry|
|Depositing User:||SH Kilcoyne|
|Date Deposited:||07 Oct 2010 09:36|
|Last Modified:||01 Dec 2015 00:03|
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