LeadFree Multilayer Piezoelectric Actuators Based on La‐Modified BiFeO 3 –BaTiO 3 Ceramics With Labyrinthine Nanodomains
Xinchao Yuan, Ting Zheng, Jiagang WuABSTRACT
Piezoelectric actuators have been applied in various precision instrument manufacturing and advanced technological fields. BF–BT‐based piezoelectric ceramics exhibit advantages such as high Curie temperature and large electro‐strain, making them highly suitable as basic materials for piezoelectric actuators, while the transformation from ceramic bulks to multilayer co‐fired ceramic actuators remains marginal even though its strain optimization has been studied widely. In this work, (1− x )Bi 0 . 95 La 0 . 05 FeO 3 – x BaTiO 3 lead‐free piezoelectric ceramics were designed and a relaxor ferroelectric with labyrinthine nanodomain was obtained at x = 0.3, showing a maximum electro‐strain of 0.23% at 6 kV/mm. Lead‐free multilayer piezoelectric actuators (MLAs) were fabricated and the electrical properties of actuators with different layer thicknesses were characterized. MLAs with a thinner layer thickness exhibit higher strain under low electric fields, while the influence of layer thickness is almost negligible under high electric fields. This study fills the research gap in the field of BF–BT‐based piezoelectric actuators.