Ferroelectric relaxor behaviour of Ba1-xAx(Ti0.7Zr0.3)O3 and Ba1-xA'2x/3□x/3(Ti0.7Zr0.3)O3 compositions (A = Ca, Sr; A' = Y, La, Bi)

• Published in: Solid state sciences 2006, Vol.8 (6), p.613-618
• Main Authors: KERFAH, A, TAÏBI, K, GUEHRIA-LAIDOUDI, A, SIMON, A, RAVEZ, J
• Format: Article
• Language: English
• Subjects: Chemical Sciences; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Dielectric properties of solids and liquids; Dielectric, piezoelectric, ferroelectric and antiferroelectric materials; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Exact sciences and technology; Material chemistry; Niobates, titanates, tantalates, pzt ceramics, etc; Permittivity (dielectric function); Physics
• ISSN: 1293-2558; 1873-3085
• DOI: 10.1016/j.solidstatesciences.2006.02.033

In order to investigate the effect of A-site homovalent and heterovalent substitution on phase transition in barium titanium zirconium oxide (Ba(Ti0.7Zr0.3)O3), dielectric studies were performed on ceramics of Ba1−xAx(Ti0.7Zr0.3)O3 and Ba1-xA'2x/3 x/3(Ti0.7Zr0.3)O3 compositions (A=Ca, Sr; A′=Y, La, Bi). A preliminary X-ray powder diffraction study has allowed us to determine the limits of solid solution for each composition. A relaxor behaviour appears whatever the value of x in the solid solution domains. The corresponding relaxor characteristics were determined and discussed according to the substituted cation in the twelve coordination number (12-C.N.) crystallographic site. Such new materials are of interest for environmental-friendly applications.