HONG Yan, TU Na, LIAO Runhua, SONG Fusheng, LI Yueming

(Jiangxi Key Laboratory of Advanced Ceramic Materials, School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi, China)

Abstract: Using solid-state route, (1-x)Na_1/2Bi_1/2TiO₃-xBi_2/3(Zn_1/3Nb_2/3)O₃(x=0, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, (1-x)NBT-xBZN) lead-free piezoelectric ceramics were prepared, and the effects of different BZN content on the structure and electrical properties of ceramic samples were investigated. The results show that (1-x)NBT-xBZN samples possess the pure perovskite structure. The morphotropic phase boundary (MPB) of the system locates in the composition range of 2%≤x≤2.5%. Certain amounts of BZN doping promoted the growth of NBT ceramic grain and increased its density and optimized the ceramic piezoelectric properties. When x= 2%, the piezoelectric constant d₃₃(d₃₃= 112 pC/N) increased by 80%, and the planar coupling factor k_p= 21%, the dielectric loss tanδ=3.59%, the relative dielectric constant ε₃₃ ^T/ε₀=1006.

Key words: lead-free piezoelectric ceramic; Na_1/2Bi_1/2TiO₃; morphotropic phase boundary