Effect of sintering temperature on the piezoelectric and ferroelectric characteristics of CuO doped 0.95(Na0.5K0.5)NbO3–0.05LiTaO3 ceramics

Crystal structure and properties of K0.5Na0.5NbO3–Bi0.5Na0.5TiO3–LiSbO3 lead-free piezoelectric ceramics

“…The electromechanical coupling factors, kp, kt, and the mechanical quality factor Qm were determined by a resonance-antiresonance method using an impedance analyzer (Agilent 4294A). The longitudinal electromechanical coupling factor, k33, was estimated from the electromechanical coupling factors, kp, kt [22]. Fig.…”

Dielectric and piezoelectric characteristics of the non-stoichiometric (Na,K)NbO3 ceramics doped with CuO

“…tric properties of NKN-based ceramics, the sintering aids such as CuO and MnO 2 have been added. Especially, Yang et al [11] and Nahm et al [12] found that the introduction of CuO could decrease sintering temperature and improve the densification and piezoelectric properties of (Na 0.5 K 0.5 )NbO 3 system ceramics. However, piezoelectric properties of above compositions are still weak for application in high-power devices such as piezoelectric transformers, ultrasonic motors or actuators.…”

An ultrasonic therapeutic transducers using lead-free Na0.5K0.5NbO3–CuNb2O6 ceramics

“…A high mechanical quality factor (Q m ) is required for actuator and high-power applications. The CuO is an excellent sintering aid and has been to improve the sintering performance of piezoelectric ceramics [18,19]. Small amounts of CuO on NKN ceramics effectively improve the Q m value without reducing the piezoelectric properties.…”