Giant power output in lead-free ferroelectrics by shock-induced phase transition

Gao, Zhipeng and Peng, Wei and Chen, Bin and Redfern, Simon A. T. and Wang, Ke and Chu, Baojin and He, Qiang and Sun, Yi and Chen, Xuefeng and Nie, Hengchang and Deng, Wen and Zhang, Lingkong and He, Hongliang and Wang, Genshui and Dong, Xianlin (2019) Giant power output in lead-free ferroelectrics by shock-induced phase transition. Physical Review Materials, 3 (3). ISSN 2475-9953 DOI

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The force-electric effect in ferroelectrics is characterized by the release of bound charge during pressure/shock-induced depolarization. In contrast to other electrical energy storage systems, the charge-storage/release by the force-electric effect of ferroelectrics is determined by polarization switching or polar-nonpolar phase transition. This offers a further set of options for materials design in the realm of energy conversion, especially for the high power density applications. Here, we report that a ferroelectric ceramic, N a 0.5 B i 0.5 Ti O 3 (NBT), can generate a high power output ( 3.04 × 10 8 W / kg ) under shock compression, which is one of the highest values achieved by the force-electric effect. The in situ synchrotron x-ray diffraction studies reveal that this power output mainly arises from a polar-nonpolar phase transition (rhombohedral-orthorhombic). First-principles calculations show that this is a first-order phase transition that undergoes two-step structure changes. These results extend the application of the force-electric effect and are a key step in understanding the phase transition behaviors of NBT under high pressure.

Item Type: Article
Uncontrolled Keywords: 2018AREP; IA75
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
08 - Green Open Access
Journal or Publication Title: Physical Review Materials
Volume: 3
Identification Number:
Depositing User: Sarah Humbert
Date Deposited: 12 Jun 2019 13:47
Last Modified: 12 Jun 2019 13:47

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