Phase structure and electrical properties of K0.5Na0.5(Nb0.94Sb0.06) O3-LiTaO3 lead-free piezoelectric ceramics

被引：20
作者：
Lin, Dunmin [1 ,2 ,3 ]
Kwok, K. W. [1 ,2 ]
Lam, K. H. [1 ,2 ]
Chan, H. L. W. [1 ,2 ]
机构：
[1] Hong Kong Polytech Univ, Dept Appl Phys, Kowloon, Hong Kong, Peoples R China
[2] Hong Kong Polytech Univ, Mat Res Ctr, Kowloon, Hong Kong, Peoples R China
[3] Sichuan Normal Univ, Coll Chem & Mat Sci, Chengdu 610066, Peoples R China
来源：
JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2008年 / 41卷 / 05期
关键词：
D O I：
10.1088/0022-3727/41/5/052002
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Lead-free piezoelectric ceramics (1-x) K0.5Na0.5( Nb0.94Sb0.06)O-3-xLiTaO(3) have been fabricated by a conventional solid-state sintering technique. The ceramics can be well sintered at 1080 - 1110 degrees C and exhibit a dense, single-phase perovskite structure at x <= 0.06. Coexistence of the tetragonal and orthorhombic phases is formed in the ceramics with 0.02 < x < 0.05, leading to a significant enhancement in piezoelectric properties. For the ceramic with x = 0.04, the piezoelectric properties become optimum: piezoelectric constant d(33) = 271 pCN(-1), electromechanical coupling coefficients k(P) = 0.53 and k(t) = 0.43. Moreover, the ceramics are non-deliquescent and exhibit excellent performance in transducer applications, indicating that the ceramics are ready for replacing lead-containing ceramics in practical applications.
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页数：4
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