Transmission electron microscopy studies of Pb(Zr0.99Ti0.01)O-3 single crystals

Room temperature HREM studies of Pb(Zr0.99Ti0.01)O-3 Single crystals reveal ed the presence of antiferroelectric alignment of the dipole moments along the [110](c) similar to that observed in PbZrO3. In the case of low Ti-cont ent lead zirconate-lead titanate crystals we found, however, diffusseness o f the 1/4 110 superlattice reflections along the [110](c) indicating a loca l disorder in the lead sublattice. The walls between 60 degrees domains wer e observed in [111](c) and [110](c) zone axis HREM images. Moreover, diffus e scattering along the [110](c) direction was observed in the paraelectric phase (at 575 K) and related to the existence of nanosize polar clusters or pretransitional disorder. (C) 1999 Elsevier Science Ltd. All rights reserv ed.