Hierarchical domain structure of lead-free piezoelectric (Na1/2 Bi1/2)TiO3-(K1/2 Bi1/2)TiO3 single crystals
Abstract
We report a unique hierarchical domain structure in single crystals of (Na1/2Bi1/2)TiO3-xat. %(K1/2Bi1/2)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 macro-domains. 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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- May 04, 2016
- Source ID
- 10.1063/1.4948478
Entities
People
- Chengtao Luo
- D. Viehland
- Haosu Luo
- Jiefang Li
- Olivier Delaire
- Wenwei Ge
- Xiaobin Li
- Yaojin Wang
Organizations
- Oak Ridge National Laboratory
- Office of Naval Research
- Shanghai Institute of Ceramics
- Virginia Tech