Hu Yang, Zhang Huazhang, Zhou Jing, Shen Jie, Chen Binbin, Li Ang, Chen Wen
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Materials Science and Engineering, Wuhan University of Technology Wuhan 430070 P. R. China
Department of Physics, School of Sciences, Wuhan University of Technology Wuhan 430070 P. R. China.
RSC Adv. 2023 Apr 11;13(17):11432-11440. doi: 10.1039/d2ra08232b.
The ferroelectric behavior of Bi(NaK)TiO has been tailored by Eu doping and the intermediate relaxor state is utilized for tristate ferroelectric memory effect. As Eu content increases, the local structural disorder tends to get enhanced and the stability of ferroelectric order gets weakened. The disruption effect of Eu is manifested structurally in XRD and PL spectra, and electrically in the ferroelectric, dielectric and piezoelectric properties. We found that the BNKT:3.0%Eu which owns a relaxor state under electrical cycle would be suitable for tristate ferroelectric memory, where two ferroelectric states and the relaxor state are respectively served as the "±1" and "0" memory states. We designed the verification experiments, and the results show good feasibility and stability. Moreover, it is innovative using PL spectra of Eu to understand the structural changes related to different memory states, owning to its sensitivity to local structural symmetry. It also implies the possibility for non-destructive optical readout.
通过铕（Eu）掺杂对铋钠钾钛酸盐（Bi(NaK)TiO）的铁电行为进行了调控，并利用中间弛豫态实现三态铁电存储效应。随着铕含量的增加，局部结构无序趋于增强，铁电有序的稳定性减弱。铕的破坏效应在X射线衍射（XRD）和光致发光（PL）光谱中表现为结构变化，在铁电、介电和压电性能方面表现为电学变化。我们发现，在电循环下具有弛豫态的BNKT:3.0%Eu适用于三态铁电存储，其中两个铁电态和弛豫态分别作为“±1”和“0”存储状态。我们设计了验证实验，结果显示出良好的可行性和稳定性。此外，利用铕的PL光谱来理解与不同存储状态相关的结构变化具有创新性，这归因于其对局部结构对称性的敏感性。这也意味着无损光学读出的可能性。
