在无放松剂铁电陶中具有很大的室温电热效应,具有广泛的操作温度范围
Xiaobo Zhao1,2, Zhiyong Zhou3, Bo Liang2
1School of Integrated Circuits, Guangdong University of Technology, Guangzhou 510006, China.
Materials (Basel, Switzerland)
|November 9, 2024
概括
研究人员开发了无电热陶,具有接近室温的过渡. 这种设计在室温下实现了很大的温度变化 (ΔT),并在广泛的操作范围内保持性能.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 陶工程 陶工程 陶工程
背景情况:
- 开发无电热材料对于可持续的冷却技术至关重要.
- 同时实现大电热效应 (ECE) 和广泛的操作温度范围仍然是一个挑战.
研究的目的:
- 设计和制造具有较大的室温ECE和广泛的操作温度范围的无陶.
- 为了研究放松铁电设计与近室温Tm和玻璃添加对ECE性能的影响.
主要方法:
- 制造没有的0.76NaNbO3-0.24BaTiO3 (NN-24BT) 陶,并添加BaO-B2O3-SiO2玻璃.
- 放松铁电性质和相位过渡行为的表征.
- 在高电场下直接测量热温度变化 (ΔT).
主要成果:
- NN-24BT陶表现出明显的放松铁电特性,Tm接近室温.
- 在室温低于11.0kV mm-1的条件下,可以达到1.3K的大小的附电热温度变化 (ΔT).
- 显著的ECE (>0.6K在6.1kV mm-1) 在23°C至69°C之间保持,周期稳定性很好 (在100个周期中<7%的变化).
结论:
- 设计具有室温Tm和玻璃添加的放松铁电的拟议策略对于高性能无ECE陶是有效的.
- 与其他无材料相比,开发的NN-24BT陶显示出优越的ECE性能.
- 这种方法有可能在其他无铁电陶系统中增强ECE,用于先进的冷却应用.
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