Bi2W2O9: A potentially antiferroelectric Aurivillius phase

DJANI, Hania, MCCABE, Emma E, ZHANG, W, HALASYAMANI, PS, FETEIRA, Antonio, BIEDER, Jordan, BOUSQUET, Eric and GHOSEZ, Philippe (2020). Bi2W2O9: A potentially antiferroelectric Aurivillius phase. Physical Review B, 101 (13), p. 134113.

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Abstract

Ferroelectric tungsten-based Aurivillius oxides are naturally stable superlattice structures, in which A-site deficient perovskite blocks [WnO3n+1]−2 (n=1,2,3,⋯) interleave with fluorite-like bismuth oxide layers [Bi2O2]+2 along the c-axis. In the n=2Bi2W2O9 phase, an in-plane antipolar distortion dominates but there has been controversy as to the ground-state symmetry. Here we show, using a combination of first-principles density functional theory calculations and experiments, that the ground state is a nonpolar phase of Pnab symmetry. We explore the energetics of metastable phases and the potential for antiferroelectricity in this n=2 Aurivillius phase.

Item Type:	Article
Identification Number:	https://doi.org/10.1103/PhysRevB.101.134113
Page Range:	p. 134113
SWORD Depositor:	Symplectic Elements
Depositing User:	Symplectic Elements
Date Deposited:	13 May 2020 09:07
Last Modified:	18 Mar 2021 01:48
URI:	https://shura.shu.ac.uk/id/eprint/26309

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