Structure and Electrical Properties of LiF Doped 0.996(0.95K_0.5Na_0.5NbO₃-0.05LiSbO₃)-0.004BiFeO₃ Piezoelectric Ceramics

Abstract

LiF was selected as a sintering additive to improve the sinterability of the 0.996(0.95K_0.5Na_0.5NbO₃-0.05LiSbO₃)-0.004BiFeO₃ lead-free piezoelectric ceramics. Results suggested that at room temperature the phase structure of the studied ceramics shifted from the coexistence of two phases to a phase in which orthorhombic was dominant when the LiF value was higher than 1.5 mol%, meanwhile, a pronounced shift of the Curie point to higher temperature was observed. The sample with 2 mol% LiF exhibited a higher mechanical quality factor Q_m value of ∼75.18. With increasing temperature from 30 to 120°C, the remnant polarization of the sample increased monotonically.

Keywords:

• Lead-free ceramics
• dielectric
• piezoelectric
• sintering