Microstructure and Electrical Properties of [(K 0.50 Na 0.50 ) 0.95− x Li 0.05 Ag x ](Nb 0.95 Ta 0.05 )O 3 Lead‐Free Ceramics

[(K 0.50 Na 0.50 ) 0.95− x Li 0.05 Ag x ](Nb 0.95 Ta 0.05 )O 3 (KNLNANT‐ x ) lead‐free piezoelectric ceramics were prepared by normal sintering. Effects of the Ag content on the microstructure and electrical properties of KNLNANT‐ x ceramics were systematically investigated. It is found that the ceramics with x =0.03 exhibit relatively good electrical properties along with high Curie temperature: ( d 33 ∼252 pC/N, T c ∼438°C, k p ∼45.4%, P r ∼30.1 μC/cm 2 , E c ∼13.8 kV/cm, ɛ r ∼1030, and tan δ∼2.6%). The related mechanism for enhanced electrical properties of the ceramics was also discussed. These results show that KNLNANT‐0.03 ceramic is a promising candidate material for high temperature lead‐free piezoelectric ceramics.