Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1476404 | Journal of the European Ceramic Society | 2007 | 4 Pages |
Abstract
Structure refinements in MIIBi4Ti4O15 (MIIÂ =Â Ca, Ba), Bi4âxBaxTi3âxNbxO12, (Na0.5Bi0.5)1âxBaxBi4Ti4O15 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 â³0.996. The coordination number of Bi3+ in fluorite layers changes from {4Â +Â 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
Authors
J. Tellier, Ph. Boullay, D. Ben Jennet, D. Mercurio,