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Crystals 2017, 7(5), 135; doi:10.3390/cryst7050135

Phase Transition Behavior of the Layered Perovskite CsBi0.6La0.4Nb2O7: A Hybrid Improper Ferroelectric

1
School of Chemistry and EaStCHEM, University of St Andrews, St Andrews KY16 9ST, UK
2
Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, UK
3
Department of Earth Sciences, The Natural History Museum, Cromwell Road, London SW7 5BD, UK
4
ISIS Facility, Rutherford Appleton Laboratory, Chilton, Oxon OX11 0QX, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Stevin Snellius Pramana
Received: 20 April 2017 / Revised: 9 May 2017 / Accepted: 10 May 2017 / Published: 13 May 2017
(This article belongs to the Special Issue Crystal Structure of Electroceramics)
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Abstract

The phase behavior of the layered perovskite CsBi0.6La0.4Nb2O7, of the Dion-Jacobson family, has been studied by high-resolution powder neutron diffraction between the temperatures of 25 < T < 850 °C. At ambient temperature, this material adopts the polar space group P21am; this represents an example of hybrid improper ferroelectricity caused by the interaction of two distinct octahedral tilt modes. Within the limits of our data resolution, the thermal evolution of the crystal structure is consistent with a first-order transition between 700 and 750 °C, with both tilt modes vanishing simultaneously, leading to the aristotype space group P4/mmm. This apparent “avalanche transition” behavior resembles that seen in the related Aurivillius phase SrBi2Nb2O9. View Full-Text
Keywords: polar crystal; layered perovskite; hybrid improper ferroelectric; phase transition polar crystal; layered perovskite; hybrid improper ferroelectric; phase transition
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Dixon, C.A.L.; McNulty, J.A.; Knight, K.S.; Gibbs, A.S.; Lightfoot, P. Phase Transition Behavior of the Layered Perovskite CsBi0.6La0.4Nb2O7: A Hybrid Improper Ferroelectric. Crystals 2017, 7, 135.

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