The structure and formation of nanotwins in BaTiO3 thin films

摘要: Abstract The structure and configuration of {111} twins in polycrystalline BaTiO3 films prepared by laser ablation deposition are investigated means high-resolution transmission electron microscopy. number density the these is high thickness twin lamellae range nanometres. In some grains, ordering nanotwins gives rise to a local which resembles that hexagonal phase. most cases extend penetrate whole grain. Nevertheless, terminate grain found. Some them very small (less than 1 nm thickness) accompanied partial dislocations with Burgers vector (a/3)〈111〉. These can be considered represent an early stage formation. Based on crystallography models for formation discussed. It turns out nucleation from dissociation a〈111〉 edge d...