RETRACTED: Relaxor or classical ferroelectric behavior in A site substituted perovskite type Ba1-x(SM0.5Na0.5)x,TiO3 (Retracted article. See vol 204, pg 4305, 2007)

New ferroelectric ceramics of ABO(3) perovskite type were synthesized in the Ba1-x(Sm0.5Na0.5)(x)TiO3 system by solid state reaction technique. The effect of the replacement of barium by samariurn and sodium in the A cationic site on structural and physical properties was investigated. These compounds crystallize with tetragonal or cubic symmetry. The material is classical ferroclectric for 0 <= x <= 0.1 and 0.5 <= x <= 0.6, and present a relaxor behavior for 0.2 <= x <= 0.4. The dielectric behavior depends upon the cationic disorder in the A site and the cell size. Small rate substitution allows a ferroelectric-paraelectric transition. For higher rate of substitution the possible random position of the Sm-Na cations brings to a relaxor sate and when the substitution rate x becomes higher than 0.5, the material comes back to a ferroelectric state due to the reduced cell size. Some of these new compositions are of interest for applications due to their physical properties and environmentally friendly character. (c) 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.