NEW PROCESSING METHOD FOR GRAIN-ORIENTED LEAD-FREE PIEZOELECTRIC Na0.5Bi0.5TiO3-BaTiO3 CERAMICS EXHIBITING GIANT PERFORMANCE

摘要

Textured ceramic compositions having improved piezoelectric characteristics as compared with their random counterparts are provided. Methods of making the compositions and devices using them are also included. More particularly, compositions comprising textured ceramic Na_0.5Bi_0.5TiO₃—BaTiO₃(NBT-BT) materials synthesized from high aspect ratio NBT seeds exhibit improved characteristics, including an increased longitudinal piezoelectric constant (d₃₃) and magnetoelectric coupling coefficient over randomly oriented NBT-BT. Additionally provided are compositions comprising of nanostructured Na_0.5B_0.5TiO₃—BaTiO₃ ferroelectric whiskers having a high aspect ratio. Nanostructured whiskers can be used to improve the piezoelectric properties of the bulk ceramics. The inventive materials are useful in microelectronic devices, with some finding particular application as multilayer actuators and transducers.