Pornsuda Bomlai, Sureewan Sukprasert, Supasarote Muensit, and Steven J. Milne

pp. 791 - 797

Abstract

Lead-free piezoelectric ceramics in the system (0.95-x)Na_0.5K_0.5NbO₃
 - 0.05LiTaO₃ - x LiSbO₃ , x = 0-0.1, were synthesized by a reaction-sintering method. The effects of the content of LiSbO₃, and the sintering temperature on phase-development, microstructure and dielectric properties of the samples were investigated. Additions of LiSbO3
 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°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.