Growth and properties of Li, Ta modified (K,Na)NbO3 lead-free piezoelectric single crystals

Xiaoqing Huo; Limei Zheng; Shujun Zhang; Rui Zhang; Gang Liu; Rui Wang; Bin Yang; Wenwu Cao; Thomas R Shrout

doi:10.1002/pssr.201308173

Growth and properties of Li, Ta modified (K,Na)NbO₃ lead-free piezoelectric single crystals

Phys Status Solidi Rapid Res Lett. 2014 Jan;8(1):86-90. doi: 10.1002/pssr.201308173.

Authors

Xiaoqing Huo¹, Limei Zheng², Shujun Zhang³, Rui Zhang², Gang Liu¹, Rui Wang⁴, Bin Yang², Wenwu Cao¹, Thomas R Shrout³

Affiliations

¹ Harbin 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.
² Harbin Institute of Technology, Condensed Matter Science and Technology Institute, Harbin 150080, P.R. China.
³ Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
⁴ Department of Chemistry, Harbin Institute of Technology, Harbin 150001, P.R. China.

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 k_t 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.

Keywords: KNN single crystals; electromechanical coupling factor; lead-free; thermal stability.

Grants and funding

P41 EB002182/EB/NIBIB NIH HHS/United States