Article ID Journal Published Year Pages File Type
1476404 Journal of the European Ceramic Society 2007 4 Pages PDF
Abstract
Structure refinements in MIIBi4Ti4O15 (MII = Ca, Ba), Bi4−xBaxTi3−xNbxO12, (Na0.5Bi0.5)1−xBaxBi4Ti4O15 and Bi4Ti3O12-PbTiO3 systems are used to report structural features of relaxor Aurivillius phases. In compounds with relaxor-like behaviour, the average structure is almost undistorted, closed to the archetypal HT paraelectric phase, with a tolerance factor ≳0.996. The coordination number of Bi3+ in fluorite layers changes from {4 + 2} for ferroelectrics to {4} for relaxors. Transmission Electron Microscopy reveals some characteristic features of relaxors such as micro-twinning, shearing-type defects which attest from the existence of a compositional inhomogeneity and a disorder at a local scale.
Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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