Title :
Transmission electron microscopy study of strontium barium niobate relaxors
Author :
Xu, Z. ; Huang, Weng-Hsing ; Viehlan, Dwight ; Neurgaonkar, R.R.
Author_Institution :
Dept. of Mater. Sci. & Eng., Illinois Univ., Urbana, IL, USA
Abstract :
Transmission electron microscopy (TEM) investigations have been performed on SrxBa1-xNb2O6 (SBN x/1-x). Bright-field imaging of ⟨100⟩-orientated SBN 60/40 and 75/25 crystals revealed nanopolar domains with a strong shape anisotropy. The morphology of the nanopolar domains was needle-like. Selected area electron diffraction (SAED) patterns revealed the existence of 1/x[110] incommensurate modulations. Dark-field imaging of the incommensurate reflections found the existence of nanometer-sized ferroelastic domains. Diffuse scattering was observed in the SAED patterns along the ⟨100⟩. This diffuse scattering is believed to arise due to strain gradient interactions between the A-site cation distribution and the incommensuration
Keywords :
barium compounds; crystal microstructure; crystal morphology; dielectric relaxation; electric domains; electron diffraction; ferroelectric materials; nanostructured materials; strontium compounds; transmission electron microscopy; (SrBa)Nb2O6; A-site cation distribution; SrxBa1-xNb2O6; bright-field imaging; dark-field imaging; diffuse scattering; incommensurate modulations; incommensuration; morphology; nanopolar domains; selected area electron diffraction; strain gradient interactions; strong shape anisotropy; transmission electron microscopy; Anisotropic magnetoresistance; Barium; Crystals; Diffraction; Morphology; Niobium compounds; Scattering; Shape; Strontium; Transmission electron microscopy;
Conference_Titel :
Applications of Ferroelectrics, 1994.ISAF '94., Proceedings of the Ninth IEEE International Symposium on
Conference_Location :
University Park, PA
Print_ISBN :
0-7803-1847-1
DOI :
10.1109/ISAF.1994.522439
