Ruddlesden-Popper结构杂化非常规铁电体的研究进展

张碧辉, 刘小强, 陈湘明

Recent Progress of Hybrid Improper Ferroelectrics with Ruddlesden-Popper Structure

ZHANG Bihui, LIU Xiaoqiang, CHEN Xiangming

图12 (a) La2SrSc2O7陶瓷的晶体结构示意图, 室温下的P−E电滞回线和不同A位离子有序度下的DFT计算能量对比[123]; (b) La2Sr(Sc1−xFex)2O7陶瓷在400 kV/cm电场和2 Hz频率下的P−E曲线[121]; (c) La2Sr(Sc1−xFex)2O7陶瓷在150~600 K温度范围内的介电常数的温度依赖性[121]; (d) La2Sr(Sc1−xFex)2O7(x=0.15)陶瓷直流磁化率的温度依赖性, 插图是Curie−Weiss拟合结果[121]; (e) La2Sr(Sc1−xFex)2O7(x=0.15)在不同温度下磁化的等温磁场依赖性[121]

Fig. 12 (a) Crystal structures, room temperature P-E loops and the A-site cation ordering dependence of DFT calculated energy for La2SrSc2O7 ceramics[123]; (b) P-E loops for La2Sr(Sc1−xFex)2O7 ceramics under a electric field of 400 kV/cm and a frequency of 2 Hz[121] ; (c) Temperature dependence of dielectric constant for La2Sr(Sc1−xFex)2O7 ceramics over the temperature range of 150-600 K during heating and cooling processes[121]; (d) Temperature dependence of DC magnetic susceptibility of La2Sr(Sc1−xFex)2O7 (x=0.15) ceramics, with inset showing Curie-Weiss fitting results[121]; (e) Isothermal field dependence of magnetization of La2Sr(Sc1−xFex)2O7 (x=0.15) ceramics at various temperatures[121]