Hybrid improper ferroelectricity and phase transition behavior of Li_(2)Nd_(2)Ti_(3)O_(10)ceramics with A-site ordered triple-layer Ruddlesden-Popper structure  

作　　者：Bi Hui Zhang Diming Xu Rui Ze Guo Lu Liu Xiao Qiang Liu Xiang Ming Chen 

机构地区：[1]Laboratory of Dielectric Materials,School of Materials Science and Engineering,Zhejiang University,Hangzhou,310058,China [2]Key Laboratory of Multifunctional Materials and Structures,Ministry of Education,School of Electronic Science and Engineering,Xi'an Jiaotong University,Xi'an,710049,China

出　　处：《Journal of Materiomics》2024年第1期145-153,共9页无机材料学学报（英文）

基　　金：supported by the National Key R&D Program of China under Grant No.2022YFB3807602;the National Natural Science Foundation of China under Grant No.52172131;the outstanding doctoral dissertation funding of Zhejiang University under Grant No.422048A.

摘　　要：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 Li_(2)Nd_(2)Ti_(3)O_(10)ceramics with A-site cation ordered triple-layer R-P structure was obtained by spark plasma sintering technique,and the crystal structure of P2_(1)ab symmetry was revealed by neutron powder diffraction and transmission electron microscope analysis.Furthermore,the switchable ferroelectricity in Li_(2)Nd_(2)Ti_(3)O_(10)ceramics has been observed at room temperature,and the saturated polarization-electric field hysteresis loop was obtained with P_(r)=0.4μC/cm^(2)under the electric field of 250 kV/cm.The phase transition behavior of Li_(2)Nd_(2)Ti_(3)O_(10)oxides was revealed by the temperature-dependence Raman and dielectric spectra combined with the piezoelectric property.

关 键 词：Hybrid improper ferroelectricity A-site ordered Ruddlesden-Popper structure Phase transition behavior 

分 类 号：TQ174.1[化学工程—陶瓷工业]