Abstract
In order to investigate the effect of A-site homovalent and heterovalent substitution on phase transition in barium titanium zirconium oxide (Ba(Ti 0.7Zr 0.3)O 3), dielectric studies were performed on ceramics of Ba 1 − x A x (Ti 0.7Zr 0.3)O 3 and Ba 1 − x A 2 x / 3 ′ (Ti 0.7Zr 0.3)O 3 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.
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