1. Hierarchical domain structure of lead-free piezoelectric (Na1/2Bi1/2)TiO3-(K1/2 Bi1/2)TiO3 single crystals.
- Author
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Chengtao Luo, Yaojin Wang, Wenwei Ge, Jiefang Li, Viehland, Dwight, Delaire, Olivier, Xiaobin Li, and Luo, Haosu
- Subjects
PIEZOELECTRIC materials research ,TITANIUM oxides ,SODIUM compounds ,BISMUTH compounds ,TRANSMISSION electron microscopy ,MOLECULAR self-assembly ,CRYSTAL morphology ,SINGLE crystals spectra - Abstract
We report a unique hierarchical domain structure in single crystals of (Na
1/2 Bi1/2 )TiO3 -xat. % (K1/2 Bi1/2 )TiO3 for x=5 and 8 by transmission electron microscopy (TEM). A high density of polar nano-domains with a lamellar morphology was found, which were self-assembled into a quadrant-like configuration, which then assembled into conventional ferroelectric macrodomains. Studies by high resolution TEM revealed that the polar lamellar regions contained a coexistence of in-phase and anti-phase oxygen octahedral tilt regions of a few nanometers in size. Domain frustration over multiple length scales may play an important role in the stabilization of the hierarchy, and in reducing the piezoelectric response of this Pb-free piezoelectric solid solution. [ABSTRACT FROM AUTHOR]- Published
- 2016
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