Hybrid improper ferroelectricity has been extensively reported through theoretical prediction and experimental investigation in the oxides with Ruddlesden-Popper (R–P) structures. However, the experimentally reported ferroelectric materials based on triple-layer R–P structures are rare, and the weak ferroelectricity impedes its practical application. In the present work, the single-phase Li₂Nd₂Ti₃O₁₀ ceramics with A-site cation ordered triple-layer R–P structure was obtained by spark plasma sintering technique, and the crystal structure of P2₁ab symmetry was revealed by neutron powder diffraction and transmission electron microscope analysis. Furthermore, the switchable ferroelectricity in Li₂Nd₂Ti₃O₁₀ ceramics has been observed at room temperature, and the saturated polarization-electric field hysteresis loop was obtained with P_r = 0.4 μC/cm² under the electric field of 250 kV/cm. The phase transition behavior of Li₂Nd₂Ti₃O₁₀ oxides was revealed by the temperature-dependence Raman and dielectric spectra combined with the piezoelectric property.

通过对具有 Ruddlesden-Popper (R-P) 结构的氧化物的理论预测和实验研究，杂化不当铁电性已被广泛报道。然而，实验报道的基于三层R-P结构的铁电材料很少，且铁电性弱阻碍了其实际应用。本工作采用放电等离子烧结技术制备了A位阳离子有序三层R-P结构的单相Li ₂ Nd ₂ Ti ₃ O ₁₀陶瓷，其晶体结构为P 2 ₁ ab对称性。通过中子粉末衍射和透射电子显微镜分析揭示。此外，在室温下观察到了Li ₂ Nd ₂ Ti ₃ O ₁₀陶瓷的可转换铁电性，并在250 kV/2的电场下得到了P _r  = 0.4 μC/cm ²的饱和极化-电场磁滞回线。厘米。通过温度依赖性拉曼光谱和介电谱与压电特性相结合，揭示了Li ₂ Nd ₂ Ti ₃ O ₁₀氧化物的相变行为。