Interesting evidence for template-induced ferroelectric behavior in ultra-thin titanium dioxide films grown on (110) neodymium gallium oxide substrates

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dc.contributor.author Deepak, Nitin
dc.contributor.author Caro, Miguel A.
dc.contributor.author Keeney, Lynette
dc.contributor.author Pemble, Martyn E.
dc.contributor.author Whatmore, Roger W.
dc.date.accessioned 2019-04-08T11:18:46Z
dc.date.available 2019-04-08T11:18:46Z
dc.date.issued 2014-01-10
dc.identifier.citation Deepak, N., Caro, M. A., Keeney, L., Pemble, M. E. and Whatmore, R. W. (2014) 'Interesting Evidence for Template-Induced Ferroelectric Behavior in Ultra-Thin Titanium Dioxide Films Grown on (110) Neodymium Gallium Oxide Substrates', Advanced Functional Materials, 24(19), pp. 2844-2851. doi: 10.1002/adfm.201302946 en
dc.identifier.volume 24 en
dc.identifier.issued 19 en
dc.identifier.startpage 2844 en
dc.identifier.endpage 2851 en
dc.identifier.issn 1616-301X
dc.identifier.uri http://hdl.handle.net/10468/7725
dc.identifier.doi 10.1002/adfm.201302946 en
dc.description.abstract The first evidence for room-temperature ferroelectric behavior in anatase-phase titanium dioxide (a-TiO2) is reported. Behavior strongly indicative of ferroelectric characteristics is induced in ultra-thin (20 nm to 80 nm) biaxially-strained epitaxial films of a-TiO2 deposited by liquid injection chemical vapor deposition onto (110) neodymium gallium oxide (NGO) substrates. The films exhibit significant orthorhombic strain, as analyzed by X-ray diffraction and high-resolution transmission electron microscopy. The films on NGO show a switchable dielectric spontaneous polarization when probed by piezoresponse force microscopy (PFM), the ability to retain polarization information written into the film using the PFM tip for extended periods (several hours) and at elevated temperatures (up to 100 °C) without significant loss, and the disappearance of the polarization at a temperature between 180 and 200 °C, indicative of a Curie temperature within this range. This combination of effects constitutes strong experimental evidence for ferroelectric behavior, which has not hitherto been reported in a-TiO2 and opens up the possibility for a range of new applications. A model is presented for the effects of large in-plane strains on the crystal structure of anatase which provides a possible explanation for the experimental observations. en
dc.description.sponsorship Irish Research Council for Science, Engineering and Technology (International Centre for Graduate Education in Micro & Nano Engineering, ICGEE); Higher Education Authority (HEA Program for Research in Third Level Institutions (2007–2011) via the INSPIRE program) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Wiley en
dc.relation.uri https://onlinelibrary.wiley.com/doi/abs/10.1002/adfm.201302946
dc.rights © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is the peer reviewed version of the following article: Deepak et al (2014), Interesting Evidence for Template‐Induced Ferroelectric Behavior in Ultra‐Thin Titanium Dioxide Films Grown on (110) Neodymium Gallium Oxide Substrates. Adv. Funct. Mater., 24: 2844-2851, which has been published in final form at https://doi.org/10.1002/adfm.201302946. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving en
dc.subject Ferroelectrics en
dc.subject Strain en
dc.subject Chemical vapor deposition en
dc.subject Atomic vapor deposition en
dc.subject Anatase en
dc.title Interesting evidence for template-induced ferroelectric behavior in ultra-thin titanium dioxide films grown on (110) neodymium gallium oxide substrates en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Lynette Keeney, Tyndall Photonics, University College Cork, Cork, Ireland. +353-21-490-3000 Email: lynette.keeney@tyndall.ie en
dc.internal.availability Full text available en
dc.date.updated 2019-03-26T09:14:35Z
dc.description.version Accepted Version en
dc.internal.rssid 252761773
dc.contributor.funder Irish Research Council for Science, Engineering and Technology en
dc.contributor.funder Science Foundation Ireland en
dc.contributor.funder Higher Education Authority en
dc.description.status Peer reviewed en
dc.identifier.journaltitle Advanced Functional Materials en
dc.internal.copyrightchecked No
dc.internal.licenseacceptance Yes en
dc.internal.IRISemailaddress lynette.keeney@tyndall.ie en
dc.relation.project info:eu-repo/grantAgreement/SFI/SFI Strategic Research Cluster/07/SRC/I1172/IE/SRC FORME: Functional Oxides and Related Materials for Electronics/ en
dc.identifier.eissn 1616-3028


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