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7 (a)室温下利用g=100衍射斑点得到的DF-TEM照片, 红蓝箭头代表沿[100]的铁电极化方向; (b)利用g=220衍射斑点得到的DF-TEM照片; (c) Ca3[Mn0.5(Fe0.5Nb0.5)0.5]2O7陶瓷室温下的PFM测试结果; (d)改变交流电压条件下的一次与二次谐波压电响应图; (e, f)不同直流偏压下的(e)振幅蝴蝶曲线及(f)相位迟滞回线[45]

Fig. 7 (a) DF-TEM image obtained at room temperature (RT) using the g=100 diffraction spot showing the ferroelectric domains, with blue and red arrows indicating directions of ferroelectric polarization along [100]; (b) DF-TEM image obtained at RT using the reflection g=220; (c) PFM measurements for Ca3[Mn0.5(Fe0.5Nb0.5)0.5]2O7 ceramics at RT: mappings of topography, amplitude contrast, phase contrast, and contact resonant frequency; (d) First and second harmonic responses versus AC voltage; (e, f) Local switching spectroscopy for (e) amplitude voltage butterfly loops and (f) phase voltage hysteresis loops under various DC bias[45]