Phase transition behavior of the layered perovskite CsBi0.6La0.4Nb2O7: a hybrid improper ferroelectric

Charlotte A. L. Dixon; Jason A. McNulty; Kevin S. Knight; Alexandra S. Gibbs; Philip Lightfoot

doi:10.3390/cryst7050135

Phase transition behavior of the layered perovskite CsBi_0.6La_0.4Nb₂O₇: a hybrid improper ferroelectric

Charlotte A. L. Dixon, Jason A. McNulty, Kevin S. Knight, Alexandra S. Gibbs, Philip Lightfoot

Research output: Contribution to journal › Article › peer-review

Abstract

The phase behavior of the layered perovskite CsBi_0.6La_0.4Nb₂O₇, of the Dion-Jacobson family, has been studied by high-resolution powder neutron diffraction between temperatures 25 < T < 850 °C. At ambient temperature this material adopts the polar space group P2_1am; 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 725 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.

Original language	English
Article number	135
Number of pages	11
Journal	Crystals
Volume	7
Issue number	5
DOIs	https://doi.org/10.3390/cryst7050135
Publication status	Published - 13 May 2017

Keywords

Polar crystal
Layered perovskite
Hybrid improper ferroelectric
Phase transition

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© 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open accessarticle distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
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Data underpinning article "Phase transition behavior of the layered perovskite CsBi0.6La0.4Nb2O7: a hybrid improper ferroelectric"
Dixon, C. A. L. (Creator), McNulty, J. A. (Creator), Knight, K. (Creator), Gibbs, A. S. (Creator) & Lightfoot, P. (Creator), University of St Andrews, 5 Jun 2017
DOI: 10.17630/404e3a8f-3346-4dcc-b90a-62795097b1eb
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title = "Phase transition behavior of the layered perovskite CsBi0.6La0.4Nb2O7: a hybrid improper ferroelectric",

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 temperatures 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 725 and 750 °C, with both tilt modes vanishing simultaneously, leading to the aristotype space group P4/mmm. This apparent {\textquoteleft}avalanche transition{\textquoteright} behavior resembles that seen in the related Aurivillius phase SrBi2Nb2O9.",

keywords = "Polar crystal, Layered perovskite, Hybrid improper ferroelectric, Phase transition",

author = "Dixon, {Charlotte A. L.} and McNulty, {Jason A.} and Knight, {Kevin S.} and Gibbs, {Alexandra S.} and Philip Lightfoot",

note = "We thank EPSRC for a PhD studentship to CALD (EP/P505097/1).",

year = "2017",

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day = "13",

doi = "10.3390/cryst7050135",

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T1 - Phase transition behavior of the layered perovskite CsBi0.6La0.4Nb2O7

T2 - a hybrid improper ferroelectric

AU - Dixon, Charlotte A. L.

AU - McNulty, Jason A.

AU - Knight, Kevin S.

AU - Gibbs, Alexandra S.

AU - Lightfoot, Philip

N1 - We thank EPSRC for a PhD studentship to CALD (EP/P505097/1).

PY - 2017/5/13

Y1 - 2017/5/13

N2 - 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 temperatures 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 725 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.

AB - 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 temperatures 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 725 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.

KW - Polar crystal

KW - Layered perovskite

KW - Hybrid improper ferroelectric

KW - Phase transition

U2 - 10.3390/cryst7050135

DO - 10.3390/cryst7050135

M3 - Article

SN - 2073-4352

VL - 7

JO - Crystals

JF - Crystals

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M1 - 135

ER -

Phase transition behavior of the layered perovskite CsBi0.6La0.4Nb2O7: a hybrid improper ferroelectric

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Data underpinning article "Phase transition behavior of the layered perovskite CsBi0.6La0.4Nb2O7: a hybrid improper ferroelectric"

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Phase transition behavior of the layered perovskite CsBi_0.6La_0.4Nb₂O₇: a hybrid improper ferroelectric