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Misfit dislocations in epitaxial Pb(Zr 0.52 Ti 0.48 )O 3  (PZT) nanoislands on SrTiO 3 (001) substrates are shown to involve strain fields that distort the PZT lattice in a tube of material with a cross-section of about 4 nm × 8 nm around each misfit dislocation. As a consequence, 10 nm thin nanoislands – around half of their volume being distorted – are not ferroelectric. This finding corresponds to an impact of the interfacial dislocations on the ferroelectric size effect. Moreover, an interface-related, size-dependent imprint effect – i. e., a vertical shift of the ferroelectric hysteresis loop – was observed in polycrystalline PZT and epitaxial BaTiO 3  nanoislands. In result, interfacial engineering is indispensable to obtain nanostructured ferroelectrics with stable polarization and switching properties.

Interfaces in nanosize perovskite titanate ferroelectrics – microstructure and impact on selected properties