ABDELMOULA, Najmeddine; CHAABANE, H.; KHEMAKHEM, Hamadi; VON DER MÜHLL, Régnault; SIMON, Annie

doi:10.1016/j.solidstatesciences.2006.01.014

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ABDELMOULA, Najmeddine
Laboratoire de Physique Appliquée [Université de Sfax] [LPA]

CHAABANE, H.
Laboratoire de Physique Appliquée [Université de Sfax] [LPA]

KHEMAKHEM, Hamadi
Laboratoire de Physique Appliquée [Université de Sfax] [LPA]

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Solid State Sciences. 2006, vol. vol. 8, n° 8, p. p. 880-887

Elsevier

Resumen en inglés

New ferroelectric ceramics of ABO3 perovskite type were synthetized in the Ba1−x(Sm0.5Na0.5)xTiO3 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 0x0.1 and x0.5, and present a relaxor behavior for 0.2x<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 state 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.< Leer menos

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BaTiO3

Dielectrics

Relaxors

Ferroelectrics

Ceramics

Perovskite

Crystal structure

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

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