Ca2+ doping effects in (K,Na, Li)(Nb0.8Ta0.2)O3 lead-free piezoelectric ceramics |
| |
| Authors: | Lei TANG Tengfei LIU Jinxu MA Xiaowen ZHANG Linan AN Kepi CHEN |
| |
| Affiliation: | 1. School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China2. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China3. Department of Materials Science and Engineering, Advanced Materials Processing and Analysis Center, University of Central Florida, Orlando, FL 32816, USA |
| |
| Abstract: | Lead-free (K0.5−x/2Na0.5−x/2Lix)(Nb0.8Ta0.2)O3 (KNLNT) and (K0.49−x/2Na0.49−x/2- LixCa0.01)(Nb0.8Ta0.2)O3 (KNLNT-Ca) ceramics were prepared by a conventional ceramic processing. Structural analysis shows that the Ca2+ doping takes the A site of ABO3 perovskite and decreases the phase transition temperature. Property measurements reveal that as a donor dopant, the Ca2+ doping results in higher room-temperature dielectric constant, lower dielectric loss, and lower mechanical quality factor. In addition, the Ca2+ doping does not change the positive piezoelectric coefficient d33, but increases the converse piezoelectric coefficient d33* significantly. This is likely due to the increase in the relaxation, as well as the appearance of (CaNa/K•--VNa/K′) defect dipoles. |
| |
| Keywords: | lead-free piezoelectric KNN converse piezoelectric coefficient donor dopant piezoelectric property polymorphic phase transition |
|
| 点击此处可从《》浏览原始摘要信息 |
|
点击此处可从《》下载全文 |
|
