Large strain under low driving field in lead‐free relaxor/ferroelectric composite ceramics

• DOI: 10.1111/jace.16256
• Publication Date: 2018-12-13T06:39:53Z
• Authors: Pengyuan Fan; Yangyang Zhang; Yiwei Zhu; Weigang Ma; Kai Liu; Xueting He; Mohsin Ali Marwat; Bing Xie; Ming Li; Haibo Zhang
• Keywords: Relaxor ferroelectric; Strain (injury)

Abstract 0.75(Na 0.5 Bi )TiO 3 –0.25SrTiO lead‐free incipient piezoceramic is a promising candidate for actuator applications due to their large reversible electromechanical strains at the relatively low driving field of 40 kV/cm. In order further reduce )TiO–0.25SrTiO relaxor ceramic meet requirements real actuators application, relaxor/ferroelectric ( RE / FE ) 0‐3 composite ceramics method was employed. The polarization and strain behaviors were examined as function weight ratio phases. It found that 90 wt% /10 0.96(Na 0.84 K 0.16 1/2 TiO –0.04SrTiO type samples provided high unipolar 0.25% corresponding large‐signal piezoelectric coefficient, d * 33 833 pm/V 30 kV/cm, which are 32% higher than values pure . enhanced electric‐field‐induced lower attributed primarily reduction in ‐ phase transition electric field. also exhibited significantly reduced frequency dependence behavior room temperature.