Summary: | In this paper, (Na,K)<sub>1−x</sub>Li<sub>.x</sub>(Nb,Sb)O<sub>3</sub>–(Bi,Na)(Sr)ZrO<sub>3</sub>–BaZrO<sub>3</sub> ceramics were fabricated with x(= Li) substitution by two-step sintering method, and their physical characteristics were investigated. When Li substitution was added to the ceramics, piezoelectric constant (d<sub>33</sub>) and electromechanical coupling factor (k<sub>p</sub>) were rapidly reduced. However, mechanical quality factor (Q<sub>m</sub>) was enhanced. For the KNN-BNZ((K,Na)(Nb)O<sub>3</sub>–(Bi,Na)(Sr)ZrO<sub>3</sub>) ceramics with Li(x) = 0 substitution<sub>,</sub> the best physical properties of d<sub>33</sub> = 300 [pC/N], k<sub>p</sub> = 0.40, Q<sub>m</sub> = 33 and dialectic constant (ε<sub>r</sub>) = 2430 were shown, respectively. Additionally, the KNN-BNZ ceramics with Li(x) = 0.02<sub>,</sub> the d<sub>33</sub> of 246[pC/N], the k<sub>p</sub> of 0.37, the Q<sub>m</sub> of 42 and the ε<sub>r</sub> of 2090 appeared, which were suitable for the low-loss piezoelectric actuator.
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