当前位置: X-MOL 学术Acta Mater. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Domain patterns and super-elasticity of freestanding BiFeO3 membranes via phase-field simulations
Acta Materialia ( IF 9.4 ) Pub Date : 2021-01-22 , DOI: 10.1016/j.actamat.2021.116689
Ren-Ci Peng , Xiaoxing Cheng , Bin Peng , Ziyao Zhou , Long-Qing Chen , Ming Liu

Super-elasticity of functional ferroelectric oxides offers promises for integrating ferroelectric films into flexible electronics. However, super-elastic deformation is a complex phenomenon related to possibly multiple concurrent mechanisms. Fundamentally understanding how multiple mechanisms contribute to the super-elasticity of ferroelectric oxides is crucial to realizing their potential flexible electronic applications. Here, we employ phase-field simulations to model the dynamics of ferroelectric domain patterns of freestanding BiFeO3 membranes to understand the origin of their super-elasticity under substantial bending deformation (5% strain). It is demonstrated that both a reversible Rhombohedral-Tetragonal (R-T) phase transition and a nearly reversible domain evolution of BiFeO3 membranes contribute to accommodating the large deformation and thus their super-elasticity. The dynamics of domain evolution also reveal the formation of an exotic ferroelectric vortex and polarization rotation before the phase transition. We constructed a diagram of phases and domain patterns as a function of the membrane thickness and bending angle, which allows one to readily predict the emergence of T phase and ferroelectric vortex in bent BFO membranes. These results not only provide fundamental understanding of mesoscale super-elastic mechanisms but also reveal exotic domain states of ferroelectric membranes.



中文翻译:

独立的BiFeO 3膜的畴模式和超弹性通过相场模拟

功能性铁电氧化物的超弹性为将铁电薄膜集成到柔性电子中提供了希望。但是,超弹性变形是与可能存在多个并发机制相关的复杂现象。从根本上理解多种机制如何有助于铁电氧化物的超弹性,对于实现其潜在的柔性电子应用至关重要。在这里,我们采用相场模拟对独立的BiFeO 3膜的铁电畴模式进行动力学建模,以了解其在显着弯曲变形(5%应变)下的超弹性的起源。已经证明,两个可逆菱面体四方(RT)的相变和的BiFeO的几乎可逆域进化3膜有助于适应较大的变形,从而具有超弹性。畴演化的动力学还揭示了在相变之前奇特的铁电涡旋的形成和极化旋转。我们根据膜厚度和弯曲角度构造了一个相和畴模式图,这使人们可以轻松预测弯曲的BFO膜中T相和铁电涡旋的出现。这些结果不仅提供了对中尺度超弹性机制的基本理解,而且揭示了铁电膜的奇异畴态。

更新日期:2021-02-12
down
wechat
bug