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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)

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,...

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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
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TAÏBI, K
GUEHRIA-LAIDOUDI, A
SIMON, A
RAVEZ, J
description 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.
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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
title 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)
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