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PMN-PT thin films: Electromechanical behaviour, polarisability and microstructure

Published online by Cambridge University Press:  11 February 2011

N. J. Donnelly ,
G. Catalan ,
C. Morros ,
R. M. Bowman ,
J. M. Gregg ,
Zian Kighelman ,
Dragan Damjanovic  and
Nava Setter
N. J. Donnelly
Affiliation:
Condensed Matter Physics and Materials Science, Queens University, Belfast BT7 1NN, N. Ireland.
G. Catalan
Affiliation:
Condensed Matter Physics and Materials Science, Queens University, Belfast BT7 1NN, N. Ireland.
C. Morros
Affiliation:
Condensed Matter Physics and Materials Science, Queens University, Belfast BT7 1NN, N. Ireland.
R. M. Bowman
Affiliation:
Condensed Matter Physics and Materials Science, Queens University, Belfast BT7 1NN, N. Ireland.
J. M. Gregg
Affiliation:
Condensed Matter Physics and Materials Science, Queens University, Belfast BT7 1NN, N. Ireland.
Zian Kighelman
Affiliation:
Ceramics Laboratory, Materials Department, Swiss Federal Institute of Technology – EPFL, CH-1015 Lausanne, Switzeland
Dragan Damjanovic
Affiliation:
Ceramics Laboratory, Materials Department, Swiss Federal Institute of Technology – EPFL, CH-1015 Lausanne, Switzeland
Nava Setter
Affiliation:
Ceramics Laboratory, Materials Department, Swiss Federal Institute of Technology – EPFL, CH-1015 Lausanne, Switzeland
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Abstract

Thin film capacitor structures of Pb(Mg1/3Nb2/3)O3 (PMN) - PbTiO3 (PT) were fabricated using pulsed laser deposition (PLD) on MgO{100} substrates using (La1/2,Sr1/2)CoO3 (LSCO) as a lower electrode. Crystallographic and dielectric characterisation confirmed perovskite relaxor-like behaviour. Measurements of the electrostrictive coefficients by in-situ X-ray diffraction, piezo-response atomic force microscopy and three point bending experiments showed both Q11 and Q13 to be comparable to accepted values for single crystals. However, for a given field, the electric field-induced strain in the thin films was much less than that of single crystal. This was clearly intimately linked to poor thin film polarisability. Previous work had shown sol-gel PMN-PT films to have significantly greater permittivities than PLD films, and a TEM investigation was undertaken to see if functional differences could be related to differences in microstructure, and hence if the functional and electromechanical properties of PLD films could be improved by attempting to replicate sol-gel microstructures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 748: Symposium U – Ferroelectric Thin Films XI , 2002 , U14.4
Copyright
Copyright © Materials Research Society 2003

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References

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