کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1476404 1510146 2007 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structure versus relaxor properties in Aurivillius type compounds
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Structure versus relaxor properties in Aurivillius type compounds
چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 27, Issues 13–15, 2007, Pages 3687-3690
نویسندگان
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