Publication Type:Conference Paper
Source:Materials Research Society Symposium - Proceedings, Volume 784, p.49-54 (2003)
Keywords:Barium compounds, Burgers vectors, Dislocation microstructures, Epitaxial growth, Ferroelectric films, film growth, lanthanum compounds, Mathematical models, molecular dynamics, Thermal effects, thin films, transmission electron microscopy
Epitaxial Ba 0.6Sr 0.4TiO 3 films were grown onto (001) LaAlO 3 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. High densities of threading dislocations was present in the films with Burgers vector b = a〈100〉. The observations reveal that 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.
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