Abstract
The Li/Ta‐codoped lead‐free (Na,K)NbO3 ceramics with Na:K ratio of 0.535:0.480 were prepared by normal sintering, whose nominal formula was noted as [(Na0.535K0.480)0.942Li0.058](Nb1−xTax)O3 (x=2, 4, 6, 8, 10, 12, 14, and 16 at.%). The X‐ray diffraction patterns and the corresponding calculation of lattice parameters showed that a morphotropic phase boundary crossing orthorhombic and tetragonal symmetries occurs at the compositions containing 6∼8 at.% Ta. Because of such transitional behavior achieved by optimizing Ta content, the piezoelectric coefficient (d33), electromechanical coupling coefficient (kp), and dielectric constant (ɛ) were enhanced to peak values, 232 pC/N, 39.4%, and 710, respectively. However, the Curie temperature (TC) and remanent polarization (Pr) show a decreasing tendency with raising Ta content, and their maximum values are 462°C and 8.73 μC/cm2, respectively.
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