Phase diagram of BiFeO3/LaFeO3 superlattices: antiferroelectric-like state stability arising from strain effects and symmetry mismatch at heterointerfaces

Carcan, Benjamin, Bouyanfif, Houssny, El Marssi, Mimoun, Le Marrec, Françoise, Dupont, Loic, Davoisne, Carine, Wolfman, Jérôme, Arnold, Donna C. (2017) Phase diagram of BiFeO3/LaFeO3 superlattices: antiferroelectric-like state stability arising from strain effects and symmetry mismatch at heterointerfaces. Advanced Materials Interfaces, 4 (11). ISSN 2196-7350. E-ISSN 2196-7350. (doi:10.1002/admi.201601036)

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Abstract

(BiFeO3)(1−x)Λ/(LaFeO3)xΛ superlattices (SLs) have been grown using pulsed laser deposition and studied by X‐ray diffraction, transmission electron microscopy (TEM), and Raman spectroscopy. The composition is varied, 0.30 ≤ x ≤ 0.85, while the modulation period Λ is kept constant at about 10 nm. Unit cell doubling signatures typical of orthorhombic Pnma symmetry for x = 0.80 and 0.85 SLs and ¼{011} antiferroelectric PbZrO3‐like reflections in SLs with 0.30 ≤ x ≤ 0.7 are detected by TEM showing a complex structural mixture at the nanoscale level. The Raman spectra confirm these observations and show a change in the SLs from a Pnma LaFeO3‐like spectra for LaFeO3‐rich period to a PbZrO3‐like spectra for BiFeO3‐rich period. Electron–phonon interactions and resonant‐like excitations are also observed in the SLs. A temperature‐dependent X‐ray diffraction investigation shows a large shift of the paraelectric‐antiferroelectric phase transition scaling with the BiFeO3 thickness. This shift is correlated with the strain state and can be explained by a strong interplay between octahedral rotation/tilt and antipolar Bi displacement. Thickness–temperature phase diagram is constructed and differs from previous report showing the extreme sensitivity of the BiFeO3 phase stability to strain effects and rotation/tilt degrees of freedom.

Item Type: Article
DOI/Identification number: 10.1002/admi.201601036
Uncontrolled keywords: Multiferroics, superlattices, epitaxial strain, phase diagram
Subjects: Q Science > QD Chemistry
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Michael Woods
Date Deposited: 16 Mar 2017 16:31 UTC
Last Modified: 12 Jul 2019 14:42 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/60951 (The current URI for this page, for reference purposes)
Arnold, Donna C.: https://orcid.org/0000-0003-0239-5790
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