Issue 14, 2023

Effect of composition gradient on domain structure and piezoelectric properties in Mn-doped KNN single crystals

Abstract

The improvement of piezoelectric properties is always a key issue in the study of piezoelectric materials. The construction of composition gradient (CG) is a novel method to improve piezoelectric properties. However, the physical mechanism of CG influence on the piezoelectric properties has to be analyzed further. We investigate the origin of the CG-affected piezoelectric property using a manganese-doped potassium sodium niobate single crystal (that is Mn: KNN) as a model system. The relationship between CG, microstructure and spontaneous polarization was explored by designing and growing Mn:KNN single crystals with different CGs. It is found that the built-in electric field (Ein) in single crystals is constructed by introducing the CG in the crystals. The large Ein induces a more ordered, large-sized striated domain structure. The Mn: KNN single crystal with a large CG has a uniform orientation of spontaneous polarization and large macro-piezoelectric properties (83 pC N−1). Therefore, it is important to explore the relationship between CG and the piezoelectric properties of single crystals in lead-free piezoelectric materials. The results can be used to further develop high-performance lead-free piezoelectric materials.

Graphical abstract: Effect of composition gradient on domain structure and piezoelectric properties in Mn-doped KNN single crystals

Supplementary files

Article information

Article type
Paper
Submitted
13 Dec 2022
Accepted
13 Mar 2023
First published
14 Mar 2023

J. Mater. Chem. C, 2023,11, 4837-4845

Effect of composition gradient on domain structure and piezoelectric properties in Mn-doped KNN single crystals

Y. Zhang, C. Hu, Y. Wang, X. Huang, X. Sun, M. Liu, B. Xing, X. Wen and H. Tian, J. Mater. Chem. C, 2023, 11, 4837 DOI: 10.1039/D2TC05312H

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