摘要
基于对人类环境的保护和发展环境友好材料与电子产品的要求,近年来开展了无铅压电陶瓷的研究与开发.文中在目前无铅压电陶瓷研究的基础上,进行了Ta、Li固溶改性铌酸钾钠无铅压电陶瓷(LNKNT)的制备和性质的研究.根据XRD分析,当Ta组分(x)为10%～20%时,LNKNT陶瓷室温相为单斜晶系钙钛矿相;当x=17%和20%时,形成完全固溶体,在单斜晶相-四方晶相相变温度附近出现单斜晶相与四方晶相共存的情形.文中还讨论了Ta组分对材料介电常数温度特性、压电性质的影响.当x=17%时,LNKNT陶瓷的压电常数、平面机电耦合系数和介电常数分别为235pC/N、0.49和1293.5.该陶瓷材料已经达到工业应用的要求,目前已被尝试应用于制造压电蜂鸣器.
In order to protect the environment and produce environmentally friendly materials and electronic devices, the research and development of lead-free piezoelectric ceramics have been carried out in recent years. Based on the current research on lead-free piezoelectric ceramics, this work investigates the preparation and ties of Liand Ta-doped sodium potassium niobate （LNKNT） ceramics. XRD was then adopted to analyze the microstructure of the ceramics. The results show that （ 1 ） the Ta-doped LNKNT ceramics with a Ta composition （x） of 10%- 20% possess a monoclinic perovskite structure at room temperature, then forms a complete solid solution when the Ta composition is 17% and 20% ; （2） the monoclinic and tetragonal phases coexist near the monoclinictetragonal phase transition temperature, The Ta compositional dependences of dielectric properties and piezoelectric properties are discussed in this paper. When x = 17% , the piezoelectric coefficient, plane electro-mechanical cou- pling factor and dielectric constant of the Ta-doped LNKNT ceramic are 235 pC/N ,0. 49 and 1293.5, respectively. So, the ceramic, which has been used to prepare a lead-free piezoelectric buzzer, meets the requirements of industrial application.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第10期105-110,共6页
Journal of South China University of Technology(Natural Science Edition)
基金
广东省自然科学基金重点项目(020951)
关键词
无铅压电陶瓷
锂
钽
铌酸钾钠
X射线衍射
介电特性
压电特性
lead-free piezoelectric ceramic
lithium
tantalum
sodium potassium niobate
X-ray diffraction
die-lectric property
piezoelectric property
