Abstract
Ceramics with composition Ba1-xNaxTi1-xNbxO3 are of either classical ferroelectric (for 0 ⩽ x < 0.075)and ferro- or antiferroelectric (for 0.55 < x ⩽ 1) or relaxor ferroelectrictype (for 0.075 ⩽ x ⩽ 0.55), the transition at Tc being only diffusewithout any frequency dispersion for this last region. All the correspondingdielectric characteristics, i.e. diffusivity of theferroelectric-paraelectric transition, frequency dispersion ofε'r, shift of Tm with frequency deviation from theCurie-Weiss law, are determined. The relaxor behaviour is more relaxor themore the composition deviates from BaTiO3 and NaNbO3. This study is inthe field of preparation of relaxor ceramics free from lead in the interest ofthe environment, which present a transition temperature close to roomtemperature.
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