Ji Lingfei

Study of (Na 0.5 K 0.5 )NbO 3 -LiNbO 3 ceramics prepared by laser sintering

The unique physical properties of the (1−x)K<inf>0.5</inf>Na<inf>0.5</inf>NbO<inf>3</inf>−xLiNbO<inf>3</inf> (KNN-LN) ceramics prepared by laser sintering were studied by XRD and Raman scattering analysis. The larger substitution of Li⁺ leads to the composition x of the optimized piezoelectric properties (d<inf>33</inf>=65 ∼ 105 pC/N and T<inf>c</inf>= 400 ∼ 440 °C) is down to x = 0.04 from 0.06. Textured structure due to strictly heating directivity of laser irradiation resulted in fine ferroelectric properties of remnant polarization and coercive field are 22.7 µC/cm² and 16.1 kV/cm. The phase transition between tetragonal and orthorhombic phases (T<inf>O-T</inf>) shifting ∼ 0°C from room is beneficial for the increasing of temperature stability of the ceramics in application. It is shown that laser sintering should be one of promising methods in preparation of functional ceramics with applicable physical properties.