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Growth and properties of Li, Ta modified (K,Na)NbO3 lead-free piezoelectric single crystals
Xiaoqing Huo1, Limei Zheng2, Shujun Zhang3
1Harbin Institute of Technology, Condensed Matter Science and Technology Institute, Harbin 150080, P.R. China ; Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
Abstract:
Li, Ta modified (K,Na)NbO3 single crystals with the size of 18 mm × 18 mm × 10 mm were successfully grown by top-seeded solution growth method, with orthorhombic-tetragonal phase transition temperature ~79 °C and Curie temperature ~276 °C. The electromechanical coupling factors k33 and kt were found to be ~88% and ~65%, respectively. The piezoelectric coefficient d33 for the [001]c poled crystals reached 255 pC/N. In addition, the electromechanical coupling factor exhibited high stability over the temperature range of -50 °C to 70 °C, making these lead free crystals good candidates for electromechanical applications.
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