Tetragonal (K, Na)NbO3 based lead-free single crystal: Growth, full tensor properties, and their orientation dependence

Limei Zheng, Junjun Wang, Xuedong Liu, Liya Yang, Xiaoyan Lu, Yanran Li, Da Huo, Weiming Lü, Bin Yang, Wenwu Cao

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Abstract

A Li and Ta modified (K, Na)NbO3 lead-free single crystal with a large size (13 × 10 × 20 mm3) has been grown by using the top-seeded solution growth method. The large size allows us to carry out an extensive study on this tetragonal crystal. We have measured a complete set of elastic, dielectric, and piezoelectric constants for the [001]C poled crystal with the single domain state. The crystal exhibits high shear piezoelectricity with d15 = 518 pC/N and k15 = 0.733, showing excellent potential in shear electro-sonic energy transformation devices. It is found that the high shear piezoelectricity originates from the vicinity of orthorhombic-tetragonal phase transition, which favors polarization rotation greatly. The orientation dependence of longitudinal dielectric, piezoelectric, and elastic constants and electromechanical coupling factor in the 3-dimentional space were calculated based on the single domain dataset. We believe that this work is of great importance for both fundamental studies and device designs for lead-free materials.

Original languageEnglish (US)
Article number172903
JournalApplied Physics Letters
Volume111
Issue number17
DOIs
StatePublished - Oct 23 2017

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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