Paper Title:
Microstructure and Ferroelectric Domains of SrBi2Ta1.6Nb0.4O9
  Abstract

The microstructure and ferroelectric domains of SrBi2Ta1.6Nb0.4O9 ceramics were investigated by means of X-ray diffraction (XRD), transmission electron microscopy (TEM) equipped with energy dispersive spectroscopy (EDS). The X-ray diffraction patterns show that the lattice constants a and b decrease, and c increases by doping with Nb into SBT sample. Accordingly, it has large strain and lattice distortion in the lattice This suggests that the Nb atoms partially occupy the location of the Ta atoms in the lattice. From TEM observations, the grains show (008) preferred orientations in the sample, which agrees well with the XRD results. The 90° domain walls are identified by the 90° rotation relationship of the electron diffraction pattern about the [001] zone axis. The 180° domain walls and anti-phase boundaries (APBs) in Nb-doped SBT ceramics are also observed, which are irregularly shaped and highly curved. The traditional α-fringes can be found in the Nb-doped SBT ceramics, which are the evidence of large strains in the lattice.

  Info
Periodical
Key Engineering Materials (Volumes 353-358)
Edited by
Yu Zhou, Shan-Tung Tu and Xishan Xie
Pages
3136-3139
DOI
10.4028/www.scientific.net/KEM.353-358.3136
Citation
H. Ke, X. J. Kou, Z. Lu, H. J. Li, W. Wang, D. C. Jia, Y. Zhou, "Microstructure and Ferroelectric Domains of SrBi2Ta1.6Nb0.4O9", Key Engineering Materials, Vols. 353-358, pp. 3136-3139, 2007
Online since
September 2007
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$32.00
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