Boosting the photostriction properties of (KNa)NbO-based ceramics modulated by introducing Ba(NiNb)O

Photostrictive materials have been widely studied due to their extensive applications in the wireless remote control technology. Compared with other materials that have been studied, (K 0.5 Na 0.5 )NbO 3 (KNN)-based ceramics have a more environment-friendly and stable application prospect. Hence, a series of (1 − x )(K 0.5 Na 0.5 )NbO 3 - x Ba(Ni 0.5 Nb 0.5 )O 3− δ ( x = 0, 0.02, 0.04, and 0.06) (KNN-BNNO) ceramics have been prepared via a solid-state reaction method to obtain excellent photostriction properties. The appropriate addition of Ba(Ni 0.5 Nb 0.5 )O 3− δ not only enhances the photostriction properties but also improves the dielectric properties. Besides, a considerable photostrictive coefficient (1.34 × 10 −9 m 2 W −1 ) and shorter response time of the maximum photo-induced strain (270 s) have been obtained for the 0.98(K 0.5 Na 0.5 )NbO 3 -0.02Ba(Ni 0.5 Nb 0.5 )O 3− δ ceramics. A large blue shift appears as the illumination intensity increases from 0.7 W cm −2 to 70 W cm −2 in the Raman spectrum of the 0.98(K 0.5 Na 0.5 )NbO 3 -0.02Ba(Ni 0.5 Nb 0.5 )O 3− δ ceramics, which indicates that a compressive strain is produced in a specific direction. This work demonstrates that (K 0.5 Na 0.5 )NbO 3 -based ceramics with excellent photostriction are obtained by introducing Ba(Ni 0.5 Nb 0.5 )O 3− δ .