在无压陶中超高性能,使用具有多相共存的Relaxor Slush极态
Hong Tao1, Haijun Wu2, Yao Liu3
1Department of Materials Science , Sichuan University , Chengdu 610064 , China.
Journal of the American Chemical Society
|August 10, 2019
概括
研究人员开发了无酸 (KNN) 压陶,呈现出一种新的极地状态. 这一突破实现了超高的压电性能, 超过商业标准, 并为先进材料提供了新的设计策略.
科学领域:
- 材料科学
- 固态物理
- 陶工程
背景情况:
- 越来越多的环境问题需要无压电替代酸 (PZT).
- 提高无压电的现有策略已经停滞不前,因此需要新的方法.
研究的目的:
- 开发无压陶,其性能与PZT相当或超过.
- 在酸 (KNN) 陶中研究一种新的泥极态及其相关的放松行为.
主要方法:
- 无酸 (KNN) 压陶的合成.
- 压电特性,包括压电系数 (d33).
- 使用Z对比成像和理论模拟进行原子分辨率偏振映射.
主要成果:
- 在无纹理KNN陶中达到650±20 pC/N的超高压电系数 (d33).
- 在铁电相位过渡过程中观察到一种新的放松行为.
- 在纳米尺度上发现了独特的多相共存的极状态,与传统的铁电松器不同.
结论:
- 在KNN陶中具有多相共存的新型泥极态为设计高性能无压电材料提供了新的途径.
- 这些发现显示出超越传统策略的重大进展,可能适用于其他功能性材料.
- 这项研究提供了一种提高无材料压电性能的新策略.
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