| Summary: | Lead-free piezoelectric ceramics in the system (0.95-x) Na<sub>0.5</sub>K<sub>0.5</sub>NbO<sub>3</sub> - 0.05LiTaO<sub>3</sub> - x LiSbO<sub>3</sub>, x = 0-0.1, were synthesized by a reaction-sintering method. The effects of the content of LiSbO<sub>3</sub>, and the sintering temperature on phase-development, microstructure and dielectric properties of the samples were investigated. Additions of LiSbO<sub>3</sub> produced a change in crystal system from orthorhombic to tetragonal. The additive reduced the temperature at which secondary recrystallisation occurred, and also affected average grain size and dielectric constant. A sintering temperature of 1050<sup>o</sup>C (for 2 h) was the optimum for this system in order to achieve a high density and high dielectric constant. A maximum dielectric constant of 1510 was recorded for the x = 0.04 composition.
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