Yang Xiaoming, Zhuo Fangping, Wang Zujian, Lv Lingfei, Liu Ying, He Chao, Long Xifa
Key Laboratory of Optoelectronic Materials Chemistry and Physics Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China.
Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China, Chinese Academy of Sciences Fujian Institute of Research on the Structure of Matter, Fuzhou 350108, China.
ACS Appl Mater Interfaces. 2020 Jun 24;12(25):28239-28245. doi: 10.1021/acsami.0c06298. Epub 2020 Jun 15.
As emerging materials for capacitor applications, antiferroelectric (AFE) materials possess high energy storage density. AFE single crystals are conducive to studying the physical mechanism of AFE response. However, the preparation of AFE single crystals is a huge and long-standing challenge. Herein, we report the effect of Na/La codoping on the energy storage properties and phase transition of Pb(LuNb)O (PLN) AFE single crystals. An enhanced recoverable energy storage density of 4.81 J/cm with a high energy efficiency of 82.36% is obtained, which is much larger than that of the PbZrO- and PLN-based AFE crystals. Two superlattice reflections, which stem from the A-site Pb ions and the ordered B-site ions, are identified by X-ray diffraction and selected-area electron diffraction. The domain structures demonstrated a high temperature stability of the AFE phase. A secondary ferroelectric phase transition is induced after codoping, resulting in a sharp improvement of polarization (12.5 μC/cm), which contributes to the enormous enhancement of energy storage density. This multiphase transition is explained using the modified Ginzburg-Landau-Devonshire phenomenology.
作为用于电容器应用的新兴材料，反铁电（AFE）材料具有高储能密度。AFE单晶有助于研究AFE响应的物理机制。然而，AFE单晶的制备是一个巨大且长期存在的挑战。在此，我们报道了Na/La共掺杂对Pb(LuNb)O（PLN）AFE单晶储能性能和相变的影响。获得了增强的可恢复储能密度4.81 J/cm³，能量效率高达82.36%，这远高于基于PbZrO和PLN的AFE晶体。通过X射线衍射和选区电子衍射确定了两个源于A位Pb离子和有序B位离子的超晶格反射。畴结构表明AFE相具有高温稳定性。共掺杂后诱导出二次铁电相变，导致极化急剧提高（12.5 μC/cm²），这有助于储能密度的大幅提高。使用修正的金兹堡 - 朗道 - 德文希尔唯象学解释了这种多相转变。
