Phase Transitions and Dielectric Properties of Lead-Free Bi0.5K0.5TiO3-BaTiO3 Piezoelectric Ceramics  

作　　者：Anucha Ruangphanit Rangson Muanghlua Surasak Niemcharoen 

机构地区：[1]Thai MicroElectronics Center (TMEC), National Electronics and Computer Technology Center, Chachoengsao 24000, Thailand [2]Department of Electronics Engineering, Faculty of Engineering, Kingmongkut's Institute of Technology Ladkrabang, Bangkok10520, Thailand

出　　处：《Journal of Energy and Power Engineering》2013年第2期370-374,共5页能源与动力工程（美国大卫英文）

摘　　要：Abstract： Lead-free piezoelectric ceramics of （1 - x） Bi0.5K0.5TiO3-BaTiO3 （BKT-BT） were fabricated by the solid state reaction method with normal sintering. The influence of BT addition on the crystal structure, phase transition and dielectric properties was investigated. The crystal structure and ferroelectric phase transition were studied by XRD （X-ray diffraction） and dielectric measurements. The complete solid solution of BKT-BT was observed for all compositions. In XRD results, all compositions showed a single phase perovskite structure with tetragonal symmetry at room temperature. With increasing BT content, the separation between diffraction peaks corresponded to increasing tetragonality. The phase transition temperature of ferroelectric tetragonal-paraelectric cubic （Tc） decreased with increasing BT content. As the amount of BT concentration increased, the ceramic became denser, and almost no porosity was finally obtained.

关 键 词：Piezoelectric ceramics perovskite XRD TETRAGONALITY BKT. 

分 类 号：TQ174.758[化学工程—陶瓷工业] TM282[化学工程—硅酸盐工业]