Influences of (LiCe) co-doping on the structure and properties of Na0.15Bi2.85Ti0.7Nb1.3O9 piezoceramics

Aurivillius-type piezoceramics, Na 0.15− x Li x Bi 2.85− x Ce x Ti 0.7 Nb 1.3 O 9 (NBTN-LC100 x ; x  = 0, 0.02, 0.04, 0.06), were fabricated by the solid-state reaction method. The crystal structure, surface microstructure, and electrical properties of NBTN-LC100x ceramics were studied systematically. The XRD revealed that the (LiCe) co-doping induced lattice distortion and the orthogonality of ceramics were weakened. The grain size decreased obviously from 23.1 to 9.1 µm and the Curie temperature ( T C ) decreased from 877 to 853 °C as the increase of (LiCe) content. As x  = 0.04, the NBTN-LC100 x (NBTN-LC4) ceramics had the best performance, its T C , tanδ at 500 °C, E C , and P r were 861 °C, 7.61%, 62 kV/cm, and 3.4 µC/cm 2 , respectively. The piezoelectric property was enhanced significantly and optimal d 33 value was about 20.7 pC/N at x  = 0.04 for NBTN-LC100 x ceramics. In addition, the NBTN-LC4 ceramics possessed a good thermal stability after annealing at 850 °C for 2 h. The high d 33 , high T C , low tanδ, good thermal stability of NBTN-LC4 ceramics make it is potential candidate in high-temperature electronic devices.