Li Yinghao, Xiong Wei, Zhou Xuefan, Luo Hang, Guo Ru, Zhang Dou
Powder Metallurgy Research Institute, State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China.
Light Alloy Research Institute, Central South University, Changsha 410083, China.
Materials (Basel). 2025 Apr 24;18(9):1937. doi: 10.3390/ma18091937.
In this work, we introduce a high entropy effect in designing a relaxor ferroelectric (RFE)-antiferroelectric (AFE) crossover ceramic by incorporating a high entropy relaxor-like oxide (PbBaSrCa)TiO with antiferroelectric NaNbO. The results show that the relaxor ferroelectricity of the system is enhanced with increasing NaNbO, and when the new composition reaches the highest configurational entropy, stable energy storage properties can be achieved. This is enabled by a high breakdown strength due to the small grain size and stable slim ferroelectric hysteresis loop with high efficiency due to entropy-stabilized short-range ordered polar nanoregions (PNRs). These findings showcase the potential of this strategy for exploiting new compositions of high-performance electrostatic capacitors.
在这项工作中，我们通过将高熵类弛豫氧化物（PbBaSrCa）TiO与反铁电体NaNbO相结合，在设计弛豫铁电体（RFE）-反铁电体（AFE）转变陶瓷时引入了高熵效应。结果表明，随着NaNbO含量的增加，该体系的弛豫铁电性增强，当新成分达到最高构型熵时，可实现稳定的储能性能。这得益于小晶粒尺寸带来的高击穿强度，以及熵稳定的短程有序极性纳米区域（PNR）导致的高效稳定细窄铁电滞回环。这些发现展示了该策略在开发高性能静电电容器新成分方面的潜力。
