Imperial College London
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ProfessorRogerWhatmore

Faculty of Engineering, Department of Materials

Visiting Professor
 
 
 
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Contact

 

r.whatmore

 
 
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Location

 

Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Deepak:2014:10.1002/adfm.201302946,
author = {Deepak, N and Caro, MA and Keeney, L and Pemble, ME and Whatmore, RW},
doi = {10.1002/adfm.201302946},
journal = {Advanced Functional Materials},
pages = {2844--2851},
title = {Interesting evidence for template-induced ferroelectric behavior in ultra-thin titanium dioxide films grown on (110) neodymium gallium oxide substrates},
url = {http://dx.doi.org/10.1002/adfm.201302946},
volume = {24},
year = {2014}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - 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.
AU  - Deepak,N
AU  - Caro,MA
AU  - Keeney,L
AU  - Pemble,ME
AU  - Whatmore,RW
DO  - 10.1002/adfm.201302946
EP  - 2851
PY  - 2014///
SN  - 1616-301X
SP  - 2844
TI  - Interesting evidence for template-induced ferroelectric behavior in ultra-thin titanium dioxide films grown on (110) neodymium gallium oxide substrates
T2  - Advanced Functional Materials
UR  - http://dx.doi.org/10.1002/adfm.201302946
UR  - http://hdl.handle.net/10044/1/47919
VL  - 24
ER  -
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