期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 40, 期 4, 页码 1198-1204出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2019.12.026
关键词
Lead-free ceramics; Bismuth ferrite; Electrostrain; Relaxor ferroelectrics
资金
- National Natural Science Foundation of China [51772242, 51621063]
- Fundamental Research Funds for the Central Universities [xjj2016017]
- 111 Project 2.0 [BP2018008]
- Innovative Research Team of Ministry of Education of China [IRT13034]
- Shaanxi Innovation Capacity Support Program [2018TD-031]
High temperature lead-free piezoceramics of 0.06SrTiO(3)-0.94[(1-x)BaTiO3- xBiFeO(3)] were fabricated by the traditional solid state reaction method. The ceramics possess the pure perovskite structures, and a morphotropic phase boundary (MPB) with the pseudo-cubic and rhombohedral phases is observed at x = 0.55-0.71. The ceramics have the obvious relaxor behaviors as confirmed by the temperature and frequency dependent dielectric curves. The largest positive electrostrain (0.25%) under 65 kV/cm is achieved in the ceramics with x = 0.63. The ceramics with x = 0.63 also exhibit a large d(33)* (425 pm/V) with a high curie temperature (T-C = 282 degrees C) and a low hysteresis (43%). The improved electromechanical properties are attributed to the existence of relaxor behavior at BiFeO3-BaTiO3 phase boundary after doping SrTiO3. These results demonstrate that the design of a ternary system like ST-BF-BT based ceramics with relaxor behavior and phase boundary composition provides an effective way to optimize the electrostrain behavior of high temperature lead-free ceramics.
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