摘要
采用传统陶瓷烧结工艺制备了(1-x)(K0．5Na0．5)NbO3-xLiNbO3无铅压电陶瓷,研究了陶瓷的结构、烧结特性及电性能特征．制备的(K0．5Na0．5)NbO3-LiNbO3陶瓷为单一的钙钛矿结构,室温下其相结构随LiNbO3含量增加逐渐由正交相向四方相转变,显微结构也由于LiNbO3含量的不同而表现出很大差异．与(K0．5Na0 5)NbO3陶瓷相比,(K0．5Na0．5)NbO3-LiNbO3陶瓷的烧结温度降低,烧结特性得到改善．(K0．5Na0．5)NbO3-LiNbO3陶瓷表现出优越的压电性能,其中0．94(K0．5Na0．5)NbO3-0．06LiNbO3(x=0．06)陶瓷的压电常数d33达到205pC／N,机电耦合系数kp为40．3％,kt达到49．8％．
Lead-free （1 - x）（K0.5Na0.5）NbO3-xLiNbO3 piezoelectric ceramics were prepared by a traditional ceramic processing. The sintering characteristic, the microstructure and electrical properties of （K0.5Na0.5）NbO3-LiNbO3 ceramics were investigated. Results show that all specimens exhibit a pure perovskite structure and the phase structure at room temperature transforms from orthorhombic to tetragonal with the increase of LiNbOa.The microstructure of （K0.5Na0.5）NbOa-LiNbO3 ceramics exhibits apparent difference due to different amounts of LiNbO3. The sinterability of （K0.5Na0.5）NbO3-LiNbO3 is improved and the sintering temperature is lower than that of pure KNN ceramics. The （1 - x）（K0.5Na0.5）NbO3- xLiNbO3 （x=0.06） ceramics exhibits an excellent piezoelectric properties with the piezoelectric constant d33, the electromechanical coupling coefficients kp and kt of 205pC/N, 40.3% and 49.8%, respectively.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第2期323-327,共5页
Journal of Inorganic Materials
基金
西北工业大学博士创新基金(CZ200609)
