Relaxor or classical ferroelectric behavior in A site substituted perovskite type Ba1-x(Sm0.5Na0.5)xTiO3

✍ Scribed by Abdelmoula, N. ;Chaabane, H. ;Khemakhem, H. ;Von der Mühll, R. ;Simon, A.

• Book ID: 105363481
• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 537 KB
• Volume: 203
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200521465

✦ Synopsis

Abstract

New ferroelectric ceramics of ABO~3~ perovskite type were synthesized in the Ba~1–x~ (Sm~0.5~Na~0.5~)~x~ TiO~3~ system by solid state reaction technique. The effect of the replacement of barium by samarium 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 ferroelectric 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. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)