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Meso- to nano-scopic domain structures in high Curie-temperature piezoelectric BiScO3–PbTiO3 single crystals of complex perovskite structure

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Abstract

Bismuth scandate–lead titanate (BS–PT) solid solution is of great interest as a promising piezoelectric material for high-temperature electromechanical applications due to its excellent comprehensive electric performance and high Curie temperature. However, the full understanding of the ferro-/piezo-electric properties of BS–PT has been strongly hindered by the lack of detailed investigation of microscopic domain structures and successful growth of high-quality crystals. In this work, detailed structural and meso-/nano-scopic domain studies of the BS–PT crystals near the morphotropic phase boundary have been carried out by various characterization techniques. The multi-scale domain structures in the 〈001〉cub-cut 0.324BS–0.676PT single crystals were investigated by a unique combination of temperature-variable birefringence imaging microscopy and piezoresponse force microscopy, in conjunction with high-resolution X-ray diffraction in the temperature range of 30–500 °C. The crystal was found to exhibit tetragonal symmetry on average at room temperature and showed a transformation to cubic symmetry around 460 °C. Complex domain structures with small domain sizes (2–6 μm) and a high density of domain walls were imaged and analyzed from meso- to nano-scopic scale, and more interestingly, local crystal distortion was found in the vicinity of the dense domain walls. The domain evolution as a function of temperature and the correlation between the domain structure and the dielectric properties have been studied. These studies of domains, symmetries and phase transitions provide a better understanding of the structure of BS–PT crystals and other related ferro-/piezo-electric single crystals on multiple length scales, and help design novel high-TC, high performance ferro-/piezo-electric materials.

Graphical abstract: Meso- to nano-scopic domain structures in high Curie-temperature piezoelectric BiScO3–PbTiO3 single crystals of complex perovskite structure

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Article information


Submitted
22 Feb 2020
Accepted
20 Apr 2020
First published
22 Apr 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

Meso- to nano-scopic domain structures in high Curie-temperature piezoelectric BiScO3–PbTiO3 single crystals of complex perovskite structure

Z. Luo, Z. Liu, D. Walker, S. Huband, P. A. Thomas, N. Zhang, W. Ren and Z. Ye, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/D0TC00924E

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