کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1506413 | 993793 | 2008 | 9 صفحه PDF | دانلود رایگان |

Two solid solutions of three-layer BaxBi4−xNbxTi3−xO12 (0 ≤ x ≤ 1.2) and four-layer Aurivillius compounds (Na0.5Bi0.5)1−xBaxBi4Ti4O15 (0 ≤ x ≤ 1), which both present a ferroelectric to relaxor-like transition with increasing x, were synthesized by solid state reaction. The evolution of their crystal structures, as a function of x, was performed using Rietveld refinements from X-ray powder diffraction data. As x increases, the average crystal structures become less distorted with respect to the archetypal high temperature tetragonal one and the coordination number of Bi3+ in M2O2 layers continuously changes from {4 + 2} to {4}. The relaxor behaviour which appears in samples for a tolerance factor t > 0.96 is associated with a general static disorder in A and M sites together with the presence of some Ba2+ cations in M2O2 layers (less than 10%).
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Journal: Solid State Sciences - Volume 10, Issue 2, February 2008, Pages 177–185