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Incommensurate-commensurate transition in the geometric ferroelectric LaTaO4

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Howieson_2020_Incommensurate_commensurate_AFM_CC.pdf (2.794Mb)
Date
04/11/2020
Author
Howieson, Grant William
Wu, Shitao
Gibbs, Alexandra S
Zhou, Wuzong
Scott, James Floyd
Morrison, Finlay D.
Keywords
Dielectrics
Ferroics
Structure-property relationships
QD Chemistry
TK Electrical engineering. Electronics Nuclear engineering
DAS
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Abstract
The layered perovskite LaTaO4 has been synthesized to be stable in both (polar) orthorhombic and (nonpolar) monoclinic polymorphs at ambient conditions. Although the structural transition between monoclinic and orthorhombic phases has been well established, there is some controversy regarding a further, unidentified transition around 500 K. Here this is identified as an incommensurate–commensurate first‐order transition between incommensurate Cmc21(α00)0s0 and commensurate Cmc21 orthorhombic phases. Transmission electron microscopy indicates partially ordered stacking of different structural units in a, identifying the local cause for the modulation, whereas variable temperature powder neutron diffraction has shown the overall macroscopic modulation vector, q ≈ (0.456, 0, 0)—roughly a 2.2 × expansion in a, corresponding to an approximate 11a commensurate superunit cell dimension. The modulation shows a continuous temperature dependence until transitioning to the basic (commensurate) cell at TIC‐C. Doping the interlayer La sites with smaller Nd cations stabilizes the incommensuration to higher temperature, suggesting the modulation is geometrically driven at the A site.
Citation
Howieson , G W , Wu , S , Gibbs , A S , Zhou , W , Scott , J F & Morrison , F D 2020 , ' Incommensurate-commensurate transition in the geometric ferroelectric LaTaO 4 ' , Advanced Functional Materials , vol. 30 , no. 45 , 2004667 . https://doi.org/10.1002/adfm.202004667
Publication
Advanced Functional Materials
Status
Peer reviewed
DOI
https://doi.org/10.1002/adfm.202004667
ISSN
1616-301X
Type
Journal article
Rights
Copyright © 2020 The Authors. Published by Wiley‐VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Description
Funding: UK Engineering and Physical Sciences Research Council (Grant Number(s): EP/P022637/1, EP/K503162/1), Science and Technology Facilities Council (Grant Number(s): RB1820307), China Scholarship Council (CN).
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  • University of St Andrews Research
URL
https://onlinelibrary.wiley.com/doi/10.1002/adfm.202004667
URI
http://hdl.handle.net/10023/20574

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