Piezoelectric and dielectric properties of Lix(K0.46Na0.54)1-xNb0.86Ta0.1Sb0.04O3 lead-free ceramics
来源期刊：中国有色金属学报(英文版)2008年第3期
论文作者：陈志武 胡建强
文章页码：623 - 626
Key words：lead-free ceramics; piezoelectric ceramics; piezoelectric property; dielectric property
Abstract: Lead-free piezoelectric ceramics Lix(K0.46Na0.54)1-xNb0.86Ta0.1Sb0.04O3 (with x ranging from 0 to 0.1) were synthesized by conventional solid state sintering method. The effect of cationic substitution of Li for K and Na in the A sites of perovskite lattice on the structure, phase transition behavior and electrical properties were investigated. Morphotropic phase boundaries(MPB) between orthorhombic and tetragonal phase are found in the composition range of 0.06≤x≤0.08. Analogous to Pb(Zr,Ti)O3, the dielectric and piezoelectric properties are enhanced for the composition near the morphotropic phase boundary. The Li0.06(K0.46Na0.54)0.94- Nb0.86Ta0.1Sb0.04O3 ceramics show excellent electrical properties, that is, piezoelectric constant d33=215 pC/N, planar electromechanical coupling factor kp=41%, dielectric constant =1 303, and dielectric loss tan δ=2.45%. The results indicate that Lix(K0.46Na0.54)1-x Nb0.86 Ta0.1Sb0.04O3 ceramic is a promising lead-free piezoelectric material.
基金信息：the National Natural Science Foundation of China
the Key Laboratory of Silicate Materials Science and Engineering (Wuhan University of Technology), Ministry of Education, China
Low Dimensional Materials and Application Technology (Xiangtan University), Ministry of Education, China
