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Diffuse x-ray scattering in the lead-free piezoelectric crystals Na1/2Bi1/2TiO3 and Ba-doped Na1/2Bi1/2TiO3
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Thomas, P. A., Trujillo, S., Boudard, M., Gorfman, S. and Kreisel, J.. (2010) Diffuse x-ray scattering in the lead-free piezoelectric crystals Na1/2Bi1/2TiO3 and Ba-doped Na1/2Bi1/2TiO3. Solid State Sciences, Vol.12 (No.3). pp. 311-317. ISSN 1293-2558
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Official URL: http://dx.doi.org/10.1016/j.solidstatesciences.200...
Abstract
X-ray diffuse scattering has been measured by single-crystal X-ray diffraction on the lead-free piezoelectric perovskites Na0.5Bi0.5TiO3 (NBT) and (Na0.5Bi0.5)(0.89)Ba0.11TiO3 (NBT-Ba-0.11). Evidence of a pronounced local structure or included phase different from the rhombohedral average symmetry (space group R3c), or of a modulated structure with a characteristic period of 40 angstrom, is presented for NBT from high-resolution synchrotron X-ray mapping and CCD diffractometer investigations. The additional scattering shows pronounced anisotropy and produces satellite peaks displaced by 0.2 in the h and k indices for reflections such as {640} indexed on the pseudo-cubic unit cell with a = 7.761(2) angstrom. By contrast, weaker, less anisotropic diffuse scattering is observed for tetragonal NBT-Ba-0.11 (space group P4mm), which is directed along the pseudo-cubic < 110 >. The lack of satellite peaks and pronounced anisotropic diffuse scattering in the tetragonal phase of phase NBT-Ba-0.11 lends support to the idea that the massive tetragonal to rhombohedral phase transition in NBT at around 503-573 K, which is absent in NBT-Ba-0.11, may be the key to understanding the local structure found repeatedly at room temperature in this complex material. (C) 2009 Elsevier Masson SAS. All rights reserved.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > QD Chemistry Q Science > QC Physics |
| Divisions: | Faculty of Science > Physics |
| Journal or Publication Title: | Solid State Sciences |
| Publisher: | Elsevier BV |
| ISSN: | 1293-2558 |
| Date: | March 2010 |
| Volume: | Vol.12 |
| Number: | No.3 |
| Number of Pages: | 7 |
| Page Range: | pp. 311-317 |
| Identification Number: | 10.1016/j.solidstatesciences.2009.06.008 |
| Status: | Peer Reviewed |
| Publication Status: | Published |
| Access rights to Published version: | Restricted or Subscription Access |
| Funder: | European Network of Excellence FAME, CONACyT, SEP, Engineering and Physical Sciences Research Council (EPSRC) |
| URI: | http://wrap.warwick.ac.uk/id/eprint/6096 |
Data sourced from Thomson Reuters' Web of Knowledge
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