Sodium Excess Ta‐Modified (K0.5Na0.5)NbO3 Ceramics Prepared by Reactive Template Grain Growth Method

Lead-free sodium excess Ta-modified (K0.470Na0.545)(Nb0.55Ta0.45)O3 (KNNT) ceramics were synthesized by a conventional and reactive templated grain growth methods, and their degree of grain orientation, microstructure, dielectric, ferroelectric, and field-induced strain properties were systematically investigated. A high degree of grain orientation (Lotgering factor F = 80%) was obtained in textured KNNT ceramics. Results showed that textured KNNT ceramics exhibit high grain orientation, dielectric constant, and field-induced strain as compared to nontextured samples of the same composition. Room temperature unipolar field-induced strain of K0.5Na0.5NbO3 (KNN) ceramics was enhanced from 0.080% for nontextured sample to 0.115% for textured sample, and their corresponding dynamic piezoelectric coefficients (d33 *) were improved from 320 pm/V to 460 pm/V, respectively.

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