Abstract
Lead‐free Li‐doped (Na,K)NbO3 ceramics with codopants of Ta and Sb with a nominal composition of [(Na0.535K0.480)0.942Li0.058](Nb0.86Ta0.10Sb0.04)O3 were prepared by normal sintering. The microstructure and piezoelectric, ferroelectric, and dielectric properties were investigated, with a special emphasis on the influence of sintering temperature from 1070° to 1100°C. All samples showed a pure pervoskite phase with tetragonal symmetry. The microstructure became denser but the volatilization of Na and K became intense on increasing the sintering temperature. Despite the absence of MPB‐like transitional behavior, the piezoelectric coefficient (d33), electromechanical coupling coefficient (kp), and dielectric constant (ɛ) showed peak values of 264 pC/N, 35.6%, and 689.4, respectively, which were obtained in the sample sintered at 1090°C, and its Curie temperature (TC) was about 338°C. An even higher d33 value can be expected if the MPB‐like transitional composition range is further determined by compensating the Na and K contents.
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