Textured ferroelectric ceramics with high electromechanical coupling factors over a broad temperature range
Shuai Yang, Jinglei Li, Yao Liu, Mingwen Wang, Liao Qiao, Xiangyu Gao, Yunfei Chang, Hongliang Du, Zhuo Xu, Shujun Zhang, Fei Li
Abstract
Abstract The figure-of-merits of ferroelectrics for transducer applications are their electromechanical coupling factor and the operable temperature range. Relaxor-PbTiO 3 ferroelectric crystals show a much improved electromechanical coupling factor k 33 (88~93%) compared to their ceramic counterparts (65~78%) by taking advantage of the strong anisotropy of crystals. However, only a few relaxor-PbTiO 3 systems, for example Pb(In 1/2 Nb 1/2 )O 3 -Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 , can be grown into single crystals, whose operable temperature range is limited by their rhombohedral-tetragonal phase transition temperatures ( T rt : 60~120 °C). Here, we develop a templated grain-growth approach to fabricate <001>-textured Pb(In 1/2 Nb 1/2 )O 3 -Pb(Sc 1/2 Nb 1/2 )O 3 -PbTiO 3 (PIN-PSN-PT) ceramics that contain a large amount of the refractory component Sc 2 O 3 , which has the ability to increase the T rt of the system. The high k 33 of 85~89% and the greatly increased T rt of 160~200 °C are simultaneously achieved in the textured PIN-PSN-PT ceramics. The above merits will make textured PIN-PSN-PT ceramics an alternative to single crystals, benefiting the development of numerous advanced piezoelectric devices.