Abstract
BNT-KNN powder (with composition 0.93Bi0.5Na0.5TiO3-0.07K0.5Na0.5NbO3) was synthesized as a single perovskite phase by conventional solid state reaction route and dense ceramics were obtained by sintering of powder compacts at 1100°C for 4 h. Dielectric study confirmed relaxor behaviour, whereas the microstructure study showed sharp cornered cubic like grains with an average grain size ~1.15 μm. The saturated polarization vs. electric field (P-E) hysteresis loops confirmed the ferroelectric (FE) nature while the butterfly shaped strain vs. electric field (S-E) loops suggested the piezoelectric nature of the BNT-KNN ceramic samples. Maximum electric field induced strain of ~0.62% suggested the usefulness of this system for actuator applications.
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