Esat, F, Comyn, TP and Bell, AJ (2014) Microstructure development of BiFeO3-PbTiO3 films deposited by pulsed laser deposition on platinum substrates. Acta Materialia, 66. 44 - 53. ISSN 1359-6454
Abstract
BiFeO3-PbTiO3 films around the morphotropic phase boundary were deposited by pulsed laser deposition on polycrystalline Pt/TiOx/SiO2/Si substrates. X-ray analysis confirms that 0.6BiFeO3-0.4PbTiO3 films are (0 0 1) tetragonal preferentially orientated due to lattice matching with the underlying substrate. The misfit strain at the substrate-film interface is relieved by a ∼19% orientation transformation from (0 0 1) to (1 0 0) due to the lattice mismatch at the substrate-film interface and the difference in thermal expansion coefficients of the substrate and deposited film. 0.7BiFeO3-0. 3PbTiO3 films are mixed-phase rhombohedral-tetragonal with (0 0 1)/(1 1 1) preferential orientation due to the lattice match to the (1 1 1) and (1 0 0) of the underlying platinum as well as to being close to the morphotropic phase boundary. Inconsistent structural and electrical properties in reported BiFeO3-PbTiO3 films are explained in terms of film morphology and diffusion of bismuth into platinum. Films below ∼220 nm thickness produce short circuits due to a Volmer-Weber growth mechanism which results in physical defects within the films. Films above this critical thickness also produce variable electrical properties due to diffusion of bismuth into the underlying platinum electrode which has been confirmed by energy dispersive X-ray spectroscopy.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | (c) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. NOTICE: this is the author’s version of a work that was accepted for publication in Acta Materialia. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Acta Materialia, 66, (2014) DOI 10.1016/j.actamat.2013.11.043 |
Keywords: | Bismuth ferrite; Growth mechanism; Pulsed laser deposition; Structural properties; Thin film |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) > Institute for Materials Research (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 27 Mar 2015 16:12 |
Last Modified: | 22 Jan 2018 07:58 |
Published Version: | http://dx.doi.org/10.1016/j.actamat.2013.11.043 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.actamat.2013.11.043 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:83840 |