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Article
Analysis of the Phase Transition and the Domain Structure in K0.5Bi0.5TiO3 Perovskite Ceramics by In Situ XRD and TEM
Journal of the American Ceramic Society
  • Mojca Otoničar, Jožef Stefan Institute
  • Srečo D. Škapin, Jožef Stefan Institute
  • Boštjan Jančar, Jožef Stefan Institute
  • Rick Ubic, Boise State University
  • Danilo Suvorov, Jožef Stefan Institute
Document Type
Article
Publication Date
12-1-2010
Abstract
The local crystal and domain structures of K0.5Bi0.5TiO3 ceramics were investigated by transmission electron microscopy (TEM) and selected-area electron diffraction (SAED). The individual grains showed a lamellar domain structure, and on the basis of spot splitting along the characteristic crystallographic directions, 90°a–a- and 90°a–c-type domains were identified. Furthermore, lamellar features within the 90° domains were observed, which we presumed were 180° domains; however, in the case of P4mm structures they cannot be distinguished by SAED. The 90° domain boundaries were (011) and (101) twin planes, typical for tetragonal perovskites. The domains could be designated as rotation twins, where the symmetry element describing the relationship between two twin domains is a twofold twin axis [011]/[101] and the symmetry operation is a 180° rotation. In order to determine the dynamics and the temperature of the phase transformation from the tetragonal to the cubic structures, high-temperature XRD and in situ heating TEM analyses were performed. The results showed a gradual phase transformation in the temperature range from ~280° to ~450°C, where some grains lost their polar domains at a lower temperature than others. These findings confirmed the existence of a binary stability field in which the cubic and tetragonal structures coexist.
Citation Information
Mojca Otoničar, Srečo D. Škapin, Boštjan Jančar, Rick Ubic, et al.. "Analysis of the Phase Transition and the Domain Structure in K0.5Bi0.5TiO3 Perovskite Ceramics by In Situ XRD and TEM" Journal of the American Ceramic Society (2010)
Available at: http://works.bepress.com/rick_ubic/61/