Abstract
(1−ϕ)(0.93 Na0.5Bi0.5TiO3–0.07K0.5Na0.5NbO3)-ϕSr0.8Bi2.15Ta2O9/(1−ϕ)(NBT–KNN)–ϕSBexT (ϕ=0, 2, 4, 8, 12, 16wt%) ceramic samples were synthesized by conventional solid state reaction route. Secondary phases started developing for higher SBexT content in the (1−ϕ)(NBT–KNN)–ϕSBexT ceramic samples. Decrease of transition temperature (Tm) with the increase of SBexT content in (1−ϕ)(NBT–KNN)–ϕSBexT ceramics was attributed to the increase of internal stress. Remnant polarization (Pr), leakage current density and polarization degradation values reduced with the increase of SBexT content in (1−ϕ)(NBT–KNN)–ϕSBexT ceramic samples. Retention of good ferroelectric properties and enhancement of fatigue-free behavior with the incorporation of SBexT phase in (1−ϕ)(NBT–KNN)–ϕSBexT ceramic samples suggested their usefulness for ferroelectric memory applications.
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