Type of dissociated misfit dislocation in perovskite films on LaAlO3

Lu, C. J.
October 2004
Applied Physics Letters;10/4/2004, Vol. 85 Issue 14, p2768
Academic Journal
A type of dissociated misfit dislocation in epitaxial Ba0.3Sr0.7TiO3 thin films on (001) LaAlO3 substrates has been studied by high-resolution transmission electron microscopy. The dislocation has a Burgers vector [210] and is dissociated into four partial dislocations with Burgers vectors of type 1/2<110>. All partials can relieve the localized misfit strain and they are interacted with three 1/2<110> stacking faults lying on (001). The partials were generated during island nucleation and mosaic growth of the BSTO film, while a small amount of excess TiO2 during film deposition favored the formation of the 1/2<110> stacking faults.


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