摘要
采用固相法制备了Na0.5Bi0.5TiO3–K0.5Bi0.5TiO3–BaTiO3–SrTiO3(NBT–KBT–BT–ST)陶瓷,该体系是按(1–2x)(0.8NBT–0.2KBT)–x(0.94NBT–0.06BT)–x(0.74NBT–0.26ST)(x=0.10、0.20、0.25、0.30、0.35、0.40、0.45)组合而成的,研究了该系陶瓷的结构与电性能。结果表明:所有样品都处于三方–四方准同型相界区域。该系陶瓷在准同型相界附近表现出了优异的压电性能,压电常数d33、机电耦合系数kp和剩余极化强度Pr随x的增加先升高后降低,其中x=0.35陶瓷的电性能最佳:d33=210 pC/N,kp=0.319,Pr=39.3μC/cm2,Ec=20.2 kV/cm,是一种良好的无铅压电陶瓷候选材料。依据准同型相界组成的线性组合规律来寻找具有优异压电性能的NBT–KBT–BT–ST陶瓷准同型相界组成是可行的。
Nao.sBi0.5TiO3-K0.5Bi0.5TiO3-BaTiO3-SrTiO3 （NBT-KBT-BT-ST） lead-free piezoelectric ceramics with the compositions of （1-2x）（0.8NBT-0.2KBT）-x（0.94NBT-0.06BT）-x（0.74NBT-0.26ST）（x=0.10, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45） were fabricated by a solid state reaction method. The structure and electrical properties for NBT-KBT-BT-ST samples were investigated. The mor- photropic phase boundary （MPB） between the rhombohedral and tetragonal phases was identified in all the samples. The results demonstrate that such ceramic systems near the MPB exhibit superior electrical properties. The piezoelectric constant d33, electrome- chanical planar coupling factor Kp and remanent polarization Pr firstly increased and then decreased with the increase ofx. The opti- mum electric properties （d33 = 210 pC/N, kp = 0.319, Pr= 39.3 μC/cm2, Ee = 20.2 kV/cm） could be obtained for a composition with x = 0.35. It is suggested that NBT-KBT-BT-ST with the composition （x = 0.35） could be a candidate material for lead-free applications. Therefore, the MPB linear combination rule could be used to search for the composition neear MPB with the excellent properties of NBT-KBT- BT-ST ceramics.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2012年第11期1641-1646,共6页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金项目(51062005,91022027)
江西省自然科学基金(2010GQW0037,2010GQW0038)
江西省高等学校“先进陶瓷材料”科技创新团队
江西省主要学科学术和技术带头人培养对象计划项目(2010DD00800)
江西省教育厅项目(GJJ11196,GJJ11197,GJJ10226,GJJ111204)
关键词
无铅压电陶瓷
准同型相界
电性能
lead-free piezoelectric ceramics
morphotropic phase boundary
electric properfi^s
