Enhanced piezoelectric response of Aurivillius ferroelectrics by constructing a novel solid solution and combining traditional chemical substitution

With the increasing demand for high-temperature piezoelectric ceramics, excellent piezoelectricity and high Curie temperature are required simultaneously. Herein, combining the advantages of constructing new-type solid solutions and traditional A-site doping strategy, Aurivillius ferroelectrics (Na0.5Bi0.5)(0.5-x/2)(Li0.5Ce0.5)(x/2)Bi2.5Ti0.5Nb1.5O9 (NBTN-LC100x, x = 0-0.16) were designed to achieve the large piezoelectric response and high Curie temperature simultaneously. The existence of a pseudo-tetragonal phase boundary together with the reduction of domain size produces a large piezoelectric coefficient (d(33) similar to 24.6 pC/N) with a fairly high T-C (similar to 825 degrees C). Moreover, pseudo-tetragonal distortion might be responsible for the excellent thermal stability of d(33) against thermal depolarization temperature (T-d). For NBTN-LC12, high-temperature electric resistivity is still above 1 x 10(5) Omega cm at 600 degrees C. The improved comprehensive properties of NBTN-LC100x ceramics demonstrate that the construction of a novel Aurivillius ferroelectrics is a promising way to explore high-temperature sensor materials.