The impact of A-Site dopant on the electromechanical properties of relaxor-PT material system
Abstract
Despite the extensive studies and commercialization of relaxor-PT crystals in medical imaging, there is still no clear understanding of the physical origin of the temperature stability of the dielectric/piezoelectric properties. The lack of understanding of the temperature dependent large electromechanical responses of relaxor ferroelectric solid solution systems has been the main obstacle tothe development of next-generation high-performance piezoelectrics. We propose to study ferroelectric materials based on the concept of local structure heterogeneity and its coupling with average structure, for application in high performance transducers with better thermal stability, further a vision to advance acoustic applications with broader design freedom. This will offer a paradigm of designing new materials with enhanced functionalities. With recent developments of advanced characterization techniques, it becomes possible to conduct atomic-resolution microscopy investigation of relaxor-based ferroelectric materials. Here we will combine state-of-the-art ex-situ and in-situ (S)TEM techniques to explore correlations of local structural heterogeneity and chemical ordering and their evolution behaviors as a function of temperature and electric field. Based on the fundamental understanding, we will design and fabricate relaxor ferroelectric materials with high piezoelectric properties with enhanced temperature stability. This project will provide knowledge and technology of high performance piezoelectric materials, including the microstructure tuning, property tailoring and material design, enabling advanced ultrasound transducers for numerous applications, which will offer enhanced thermal stability and broadened device design freedom. In addition, this project will establish the fundamental understanding of the relationships of the materials microstructure, average structure and property, guiding the material design through local structure hetereogeneity and macroscopic average structure. All the experiments and technical studies will be presented to various conferences,including International Workshop on Acoustic Transduction Materials and Devices, IEEE International Symposium on Applications of Ferroelectrics to discuss the research progress and potential international collaborations and published in scientific literature/peerreviewed journals.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 05, 2021
- Source ID
- N629092112037
Entities
People
- Shujun Zhang
Organizations
- Office of Naval Research
- United States Navy
- University of Wollongong