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Initial Growth Stages of Epitaxial BaTiO3 Films on Vicinal SrTiO3:Nb (001) Substrates

Published online by Cambridge University Press:  17 March 2011

A. Visinoiu ,
M. Alexe ,
H. N. Lee ,
D. N. Zakharov ,
A. Pignolet ,
D. Hesse  and
U. Gösele
A. Visinoiu
Affiliation:
Max Planck Institute of Microstructure Physics, D-06120 Halle (Saale), Germany
M. Alexe
Affiliation:
Max Planck Institute of Microstructure Physics, D-06120 Halle (Saale), Germany
H. N. Lee
Affiliation:
Max Planck Institute of Microstructure Physics, D-06120 Halle (Saale), Germany
D. N. Zakharov
Affiliation:
Max Planck Institute of Microstructure Physics, D-06120 Halle (Saale), Germany
A. Pignolet
Affiliation:
Max Planck Institute of Microstructure Physics, D-06120 Halle (Saale), Germany
D. Hesse
Affiliation:
Max Planck Institute of Microstructure Physics, D-06120 Halle (Saale), Germany
U. Gösele
Affiliation:
Max Planck Institute of Microstructure Physics, D-06120 Halle (Saale), Germany
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Abstract

The growth mechanism of epitaxial BaTiO3 films on vicinal Nb-doped SrTiO3 (SrTiO3:Nb) (001) substrate surfaces was studied in terms of surface morphology, crystalline orientation, microstructure, and film/substrate interface. Well-oriented BaTiO3 thin films were grown on SrTiO3 substrates with well-defined terraces by pulsed laser deposition. The regularly terraced TiO2-terminated surfaces of vicinal SrTiO3:Nb (001) substrates were prepared by a definite chemical and thermal treatment. Under our conditions, BaTiO3 seems to grow with a layer-then-island (Stranski-Krastanov) growth mechanism. In order to investigate the orientation and crystallinity of the BaTiO3 films, x-ray diffraction and high-resolution transmission electron microscopy were performed. Ferroelectricity of the BaTiO3 films was proved by electrical measurements performed on Pt/BaTiO3/SrTiO3:Nb heterostructures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 688: Symposium C – Ferroelectric Thin Films X , 2001 , C8.4.1
Copyright
Copyright © Materials Research Society 2002

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