晨间信号Morning Signal
《科学》 第392卷 第6797期 · 2026年4月30日 · 中文解读

多切片电子叠层成像连接弛豫铁电体的实验与理论

Bridging experiment and theory of relaxor ferroelectrics with multislice electron ptychography · M. Zhu et al.
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本文利用多切片电子叠层成像和键价分子动力学模拟,对PMN-0.32PT弛豫铁电体薄膜进行了三维表征,揭示了原子到畴尺度的极性结构及其与化学无序和应变的关联。
原文开头
Menglin Zhu1†, Michael Xu1†, Yubo Qi2,3, Colin Gilgenbach1, Jieun Kim4,5, Jiahao Zhang3, Bridget R. Denzer1, Lane W. Martin4,6,7, Andrew M. Rappe3, James M. LeBeau1* Introducing structural and/or chemical heterogeneity into otherwise ordered crystals can dramatically alter material properties. Lead-based relaxor ferroelectrics such as 0.68Pb(Mg1/3Nb2/3)O3-0.32PbTiO3 are prototypical examples. We performed three-dimensional (3D) volumetric characterization using multislice electron ptychography (MEP) and bond valence molecular dynamics (BVMD) simulations. Real-space comparisons between the two under varying strain states revealed a coherent 3D view of the “polar slush.” Dipolar correlations from the atomic to domain scales are shown to be jointly modulated by strain and chemical configurations, with the best agreement found in a model accounting for both overall chemical disorder and residual short-range order. …
摘自《科学》(Science)第392卷 第6797期 · 2026年4月30日,M. Zhu et al.。仅引用开头一小段供了解文章,版权归原刊所有,全文请阅读原刊。
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