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

Hervoches, CH; Sneddon, A; Riggs, R; Kilcoyne, SH; Manuel, P; Lightfoot, P

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.

Citation

Hervoches, C., Sneddon, A., Riggs, R., Kilcoyne, S., Manuel, P., & Lightfoot, P. (2002). Structural behavior of the four-layer aurivillius-phase ferroelectrics SrBi4Ti4O15 and Bi5T i3FeO15. Journal of Solid State Chemistry, 164(2), 280-291. https://doi.org/10.1006/jssc.2001.9473

• Journal Article Type: Article
• Publication Date: Mar 1, 2002
• Deposit Date: Oct 7, 2010
• Journal: Journal of Solid State Chemistry
• Print ISSN: 0022-4596
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 164
• Issue: 2
• Pages: 280-291
• DOI: https://doi.org/10.1006/jssc.2001.9473
• Publisher URL: http://dx.doi.org/10.1006/jssc.2001.9473