Alkali Metal Non-Stoichiometric Effects in (K0.5Na0.5)NbO3 Based Piezoelectric Ceramics

被引：11
|
作者：
Lee, S. C. [1 ]
Yeo, H-G. [1 ]
Cho, J. H. [1 ]
Sung, Y. S. [1 ]
Kim, M-H. [1 ]
Song, T. K. [1 ]
Kim, S. S. [2 ]
Choi, B. C. [3 ]
Choi, K-S. [4 ]
机构：
[1] Changwon Natl Univ, Sch Nano & Adv Mat Engn, Chang Won 641773, South Korea
[2] Changwon Natl Univ, Dept Phys, Chang Won 641773, South Korea
[3] Pukyong Natl Univ, Dept Phys, Pusan 608737, South Korea
[4] Sunchon Natl Univ, Dept Phys, Sunchon 540742, Chonnam, South Korea
来源：
JOURNAL OF THE KOREAN PHYSICAL SOCIETY | 2010年 / 56卷 / 01期
关键词：
Lead-free; Piezoelectric; Stoichiometry; Phase transition; DIELECTRIC-PROPERTIES; SYSTEM;
D O I：
10.3938/jkps.56.453
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Alkali-metal-excess lead-free 0.93(K0.5Na0.5)((1+x))NbO3-0.07LiNbO(3) (KNNL) piezoelectric ceramics were prepared by using a solid state reaction. The contents of both K and Na were simultaneously controlled to 4 mol% excess. From X-ray diffraction and temperature-dependent dielectric constant measurements, a polymorphic phase transition (PPT) between the tetragonal and orthorhombic phases was observed by changing the stoichiometry of x. With increasing (K+Na) content, the PPT temperature increased, but the Curie temperature decreased. The highest piezoelectric constant was 189 pC/N for x = 0.01, where the PPT temperature was around room temperature.
引用
收藏
页码：453 / 456
页数：4
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