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Article Dans Une Revue Solid State Sciences Année : 2008

Structural evolution in three and four-layer Aurivillius solid solutions: A comparative study versus relaxor properties

Résumé

Two solid solutions of three-layer BaxBi4xNbxTi3xO12 (0 x 1.2) and four-layer Aurivillius compounds (Na0.5Bi0.5)1xBaxBi4Ti4O15 (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 Bi3þ in M2O2 layers continuously changes from {4 þ 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 Ba2þ cations in M2O2 layers (less than 10%).

Dates et versions

hal-00305400 , version 1 (24-07-2008)

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Jenny Tellier, P. Boullay, D. Ben Jennet, D. Mercurio. Structural evolution in three and four-layer Aurivillius solid solutions: A comparative study versus relaxor properties. Solid State Sciences, 2008, 10, pp.177-185. ⟨10.1016/j.solidstatesciences.2007.09.010⟩. ⟨hal-00305400⟩
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