(Na_(0.5)K_(0.5-x)Li_x)NbO_3高温无铅压电陶瓷性能研究  

Study on the performance of (Na_(0.5)K_(0.5-x)Li_x)NbO_3 high-temperature lead-free piezoelectric ceramics

作　　者：王矜奉[1] 亓鹏[1] 王春明[1] 郑立梅[1] 盖志刚[1] 

机构地区：[1]山东大学物理学院,山东济南250100

出　　处：《电子元件与材料》2009年第5期14-16,共3页Electronic Components And Materials

基　　金：国家自然科学基金资助项目(No.50572056);教育部博士点基金资助项目(No.20070422059)

摘　　要：为降低成本,采用传统电子陶瓷工艺制备了(Na0.5K0.5–xLix)NbO3(x=0.057～0.066)无铅压电陶瓷。Li取代K可以明显提高样品的居里温度(tC),x=0.066时样品的tC高达510℃,比纯(Na0.5K0.5)NbO3陶瓷高70℃左右。x=0.064时样品的d33高达212pC/N,kp为45.7%。x=0.063～0.066时样品的tanδ均低于0.020。特别是,x=0.066的样品经450℃退火24h,d33仍高达125pC/N。实验表明,(Na0.500K0.434Li0.066)NbO3是高性能的高温无铅压电陶瓷。In order to reduce the cost, （Na0.5K0.5-xLix）NbO3 （x = 0.057 - 0.066） lead-free piezoelectric ceramics were fabricated by the traditional electroceramic processing. It is found that Curie temperature （tc） of the ceramic samples substituted by Li for K is obviously raised, tc of the sample of x = 0.066 is as high as 510 ℃ with 70 ℃ higher than the pure （Na0.5K0.5）NbO3 ceramic. The piezoelectric constant （d33） is as high as 212 pC/N, and planar electromechanical coupling factor （kp） reaches 45.7% for the sample ofx = 0.064. The dielectric loss （tanδ） of the samples ofx = 0.063 - 0.066 is below 0.020. Especially, the sample of x = 0.066 still has a high d33 value of 125 pC/N after 24 h annealing at 450 ℃. These results indicate that （Na0.500K0.434Li0.066）NbO3 is a high-temperature lead-free piezoelectric ceramics with high performance.

关 键 词：无机非金属材料 无铅压电陶瓷 相变 居里温度 压电常数 

分 类 号：TM282[一般工业技术—材料科学与工程]