Bi改性铌酸钾钠基无铅压电陶瓷的温度稳定性  

Temperature stability of Bi-modified potassium-sodium niobate based lead-free piezoelectric ceramics

作　　者：吴清早[1] 王矜奉[2] 郑立梅[2] 臧国忠[3] 赵明磊[2] 

机构地区：[1]中国船舶重工集团第七二六研究所,上海201108 [2]山东大学物理学院,山东济南250100 [3]聊城大学材料科学与工程学院,山东聊城252059

出　　处：《电子元件与材料》2009年第11期1-4,共4页Electronic Components And Materials

基　　金：国家自然科学基金资助项目(No.50802038);教育部博士点基金资助项目(No.20070422059)

摘　　要：铌酸钾钠基压电陶瓷(Na0.53K0.41Li0.06)Nb0.955Sb0.045O3的正交–四方多型相变在室温附近,具有良好的压电性能,但其温度稳定性很差。通过掺杂Bi2O3,使该陶瓷的正交–四方多型相变温度tO-T从15℃降低到了–9℃,同时保持了较高的居里温度tC(368℃),从而显著改善了其压电性能的温度稳定性。由于Bi3+施主掺杂作用和Sb5+较强的电负性,改性后的陶瓷保持了优良的电学性能:d33=213pC/N,kp=0.441,ε3T3=1319,tanδ=0.016。Potassium-sodium niobate based piezoelectric ceramics, （Na0.53K0.41Li0.06）Nbo.955Sb0.045O3 （NKLNS）, show excellent piezoelectric properties as their orthorhombic-tetragonal polymorphic phase transition temperature is colse to room temperature. However, the piezoelectric properties are unstable with the change of temperature. With the doping of Bi2O3, the orthorhombic-tetragonal phase transition temperature tot of the ceramics can be decreased from 15 ℃ to - 9 ℃, while the higher Curie temperature tc （368℃） can be maintained. Therefore the temperate stability of the piezoelectric properties of the ceramics is effectively improved. The Bi-modified ceramics exhibit excellent electrical properties with d33 = 213pC/N, kp= 0.441, ε^T33=I 319 and tanδ = 0.016, owing to the donor doping effect of Bi^3＋ and strong electronegativity of Sb^5＋.

关 键 词：铌酸钾钠 多型相变 温度稳定性 无铅压电陶瓷 

分 类 号：TM282[一般工业技术—材料科学与工程]