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This paper presents the application of an ordinary sintering process for 3 h in air to fabricate highly dense (Na 0.52 K 0.44 Li 0.04 )(Nb 0.88 Sb 0.08 Ta 0.04 )O 3  (NKN-LST) ceramics with excellent piezoelectric properties at a lower sintering temperature through the use of excess Na 2 O as a sintering aid. The effects of sintering temperature in the range 940–1100 °C and Na 2 O addition in the range of 0 to 3.0 mol% on the density, sintering behavior, microstructure, dielectric and piezoelectric properties of the NKN-LST ceramics are investigated. Analysis reveals that NKN-LST ceramics samples sintered at 1020 °C for 3 h in air with 1.5 mol% excess Na 2 O achieve the highest electromechanical coupling factor and piezoelectric coefficient values of 0.45 and 364 pC/N, respectively.

Low-temperature sintering and piezoelectric properties of Na 2 O excess (Na 0.52 K 0.44 Li 0.04 )(Nb 0.88 Sb 0.08 Ta 0.04 )O 3 ceramics