Large electrostrain in low‐temperature sintered NBT‐BT‐0.025FN incipient piezoceramics
Kai Liu, Yangyang Zhang, Mohsin Ali Marwat, Ge Wang, Dawei Wang, Weigang Ma, Wei Tian, Mei li, Jiwen Xu, Huabin Yang, Suwadee Kongparakul, Chanatip Samart, Jiadong Zang, Pengyuan Fan, Haibo Zhang
Abstract
Abstract It is well‐known that the high sintering temperatures of (Na 1/2 Bi 1/2 )TiO 3 (NBT)‐based incipient piezoceramics limit their applications on low‐cost multilayer piezoelectric actuators with base metal internal electrodes. In this work, a synergistic sintering additive of 0.75 wt% Li 2 CO 3 and 0.75 wt% CuO was utilized to explore the effect on sintering behavior and electrostrain of (Na 1/2 Bi 1/2 ) 0.935 Ba 0.065 Ti 0.975 (Fe 1/2 Nb 1/2 ) 0.025 O 3 (NBT‐BT‐0.025FN) incipient piezoceramic. The optimal sintering temperature of NBT‐BT‐0.025FN decreased from 1160°C to 940°C due to the formation of a liquid phase, with limited degradation on electrostrain. When sintered at 940°C, a large strain of 0.39% (a nominal piezocoefficient of 571 pm/V) was achieved, which is promising for potential actuator applications co‐firing with Ag electrodes.