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Title: Designing new n=2 Sillen-Aurivillius phases by lattice-matched substitutions in the halide and [Bi2O2](2+) layers
Authors: Liu, S
Blanchard, PER
Avdeev, M
Kennedy, BJ
Ling, CD
Issue Date: 1-Sep-2013
Publisher: Academic Press Inc Elsevier Science
Citation: Liu, S., Blanchard, P. E. R., Avdeev, M., Kennedy, B. J., & Ling, C. D. (2013). Designing new n=2 Sillen-Aurivillius phases by lattice-matched substitutions in the halide and [Bi2O2](2+) layers. Journal of Solid State Chemistry, 205, 165-170.
Abstract: Abstract A new n=2 Sillen–Aurivillius compound Bi3Sr2Nb2O11Br has been synthesised based on Bi3Pb2Nb2O11Cl by simultaneously replacing Pb2+ with Sr2+ and Cl− with Br−. Rietveld refinements against X-ray and neutron powder diffraction data revealed a significant relative compression in the stacking axis (c-axis) of the new compound. Sr2+ doping reduces the impact of the stereochemically active 6s2 lone pair found on Pb2+ and Bi3+, resulting in a contraction of the c-axis by 1.22% and an expansion of the ab plane by 0.25%. This improves the inter-layer compatibility with the larger halide Br−. Analysis of X-ray absorption near-edge spectroscopy data show that the ferroelectric distortion of the B-site cation is less apparent in Bi3Sr2Nb2O11Br compared to Bi3Pb2Nb2O11Cl, and variable-temperature neutron diffraction data show no evidence for a ferroelectric distortion.© 2013, Elsevier Inc
ISSN: 0022-4596
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