NDLI: Title : Ferroelectric behavior in ultra-thin titanium dioxide films

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Title : Ferroelectric behavior in ultra-thin titanium dioxide films

Content Provider	Semantic Scholar
Author	Deepak, N. Caro, Miguel A. Lynette Keeney Pemble, Martyn E. Whatmore, Roger W.
Copyright Year	2019
Abstract	This paper reports the first-ever presentation of evidence for room-temperature ferroelectric behavior in anatase-phase titanium dioxide (a-TiO2). It is shown that behaviour strongly indicative of ferroelectric behavior is induced in ultra-thin (20nm to 80nm) biaxially-strained epitaxial films of a-TiO2 deposited by liquid injection chemical vapour deposition onto (110) Submitted to neodymium gallium oxide (NGO) substrates. The structural properties of the films were analyzed by x-ray diffraction and high-resolution transmission electron microscopy, which showed significant orthorhombic strain in films. Possible ferroelectric behavior was probed by piezoresponse force microscopy (PFM). The films on NGO showed a switchable dielectric spontaneous polarization, 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 is believed to constitute 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 devices and materials 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.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://cora.ucc.ie/bitstream/handle/10468/7725/9706.pdf?isAllowed=y&sequence=4
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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