Microstructure and Electrical Properties of Lead-Free (Na0.5K0.5)NbO3 - Bi0.5(Na0.97K0.03)0.5TiO3 Ceramics

被引：0
作者：
Wang, Chun Huy [1 ,2 ]
Wei, Ming-Qiu [2 ]
机构：
[1] Nan Jeon Inst Technol, Dept Elect Engn, Tainan 737, Taiwan
[2] Nan Jeon Inst Technol, Grad Sch Engn Sci & Technol, Tainan 737, Taiwan
来源：
FRONTIERS OF GREEN BUILDING, MATERIALS AND CIVIL ENGINEERING III, PTS 1-3 | 2013年 / 368-370卷
关键词：
Lead-free Ceramics; Piezoelectric Property; Dielectric Property; Sintering; Poling; PIEZOELECTRIC PROPERTIES;
D O I：
10.4028/www.scientific.net/AMM.368-370.760
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
(Na0.5K0.5)NbO3 with Bi-0.5(Na0.97K0.03)(0.5)TiO3 with x <= 0.05 has been prepared by the conventional mixed oxide process. X-ray diffraction analysis revealed that, during sintering, all the Bi(Na0.97K0.03)TiO3 diffuses into the lattice of (Na0.5K0.5)NbO3 to form a solid solution with a perovsldte structure. A morphotropic phase boundary (MPB) between orthorhombic (O) and rhombohedral (R) was found at the composition 0.98(Na0.5K0.5)NbO3-0.02Bi(0.5)(Na0.97K0.03)(0.5)TiO3 [abbreviated as 0.98NKN-0.02BNKT] with correspondingly enhanced dielectric and piezoelectric properties. For 0.98NKN-0.02BNKT ceramics, the electromechanical coupling coefficients of the planar mode k(p) and the thickness mode k(t) reach 0.33 and 0.49, respectively, after sintering at 1100 degrees C for 3 h. The ratio of the thickness coupling coefficient to the planar coupling coefficient is 1.48. With suitable Bi-0.5(Na0.97K0.03)(0.5)TiO3 concentration, a dense microstructure and good electrical properties are obtained.
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页码：760 / +
页数：2
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