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Threading dislocation generation in epitaxial ,,Ba,Sr...TiO3 films grown on ,,001... LaAlO3 by pulsed laser deposition

Summary: Threading dislocation generation in epitaxial ,,Ba,Sr...TiO3 films grown
on ,,001... LaAlO3 by pulsed laser deposition
I. B. Misirlioglu, A. L. Vasiliev, M. Aindow,a)
and S. P. Alpay
Department of Metallurgy and Materials Engineering and Institute of Materials Science,
University of Connecticut, Storrs, Connecticut 06269
R. Ramesh
Department of Materials and Nuclear Engineering, University of Maryland, College Park, Maryland 20742
Received 11 November 2003; accepted 7 January 2004
Epitaxial Ba0.6Sr0.4TiO3 films were grown onto 001 LaAlO3 by pulsed-laser deposition, and the
dislocation structures of the films were investigated using transmission electron microscopy. Misfit
dislocations with a periodicity of about 7 nm and Burgers vectors b a 100 were observed at the
interface. A high density of threading dislocations was present the films and these also had b
a 100 . The data indicate that the threading dislocations are not generated as the result of
half-loop climb from the deposit surface as proposed previously, but are instead formed when misfit
dislocations are forced away from the interface during island coalescence. 2004 American
Institute of Physics. DOI: 10.1063/1.1664035
The effects of microstructural features such as grain
boundaries and structural 90 domains on the physical and
dynamic properties of ferroelectric films have been studied


Source: Alpay, S. Pamir - Department of Materials Science and Engineering, University of Connecticut


Collections: Materials Science