主题：Understanding structure and functionaproperties of disordered systems: new opportunities based on advanced 4D-STEM analysis

时间：2026年9月17日（周四）下午：14：00-15：30

地点：深圳技术大学B2-801会议室

演讲嘉宾：德国卡尔斯鲁厄理工学院&达姆施塔特工业大学  Christian Kubel教授

主讲人简介(About the speaker)：

Christian Kubel教授现任德国卡尔斯鲁厄理工学院(Karlsruhe Institute of Technology,KIT)教授，并担任KIT先进电子显微镜研究部门负责人、先进微纳设备中心副主任，同时兼任达姆施塔特工业大学教授、亥姆霍兹-乌尔姆研究所(HIU)PI及英国伦敦帝国理工学院客座教授。Christian Kubel教授长期致力于先进电子显微学方法的开发与应用是德国电子显微镜学会理事，组织和主持了多次国际电子显微学会议，并担任欧洲奥德瑞国际显微学会议(MC2025)大会主席。他在四维扫描透射电子显微技术(4D-STEM)、原位透射电子显微技术(in-situ TEM)及三维电子显微重构(Electrontomography)等领域取得了系列重要成果，发展了多种先进电子显微表征方法，推动了非晶材料、半导体、新能源材料、量子材料及纳米催化材料等领域关键科学问题的研究。Christian Kubel教授主持多项德国科学基金会(DFG)、德国联邦教育与研究部(BMBF)及欧盟(EU)科研项目，相关研究成果发表于Nature Communications、Advanced Materials、Ultramicroscopy等国际知名期刊，论文累计被引用超过20000次，H因子72。

讲座内容摘要：

Understanding the structure-property relationships of disordered materials remains a major challenge due tohe absence of long-range periodicity. Their functional properties are governed by short- and medium-range atomicorder, nanoscale structural heterogeneity, and local strain, which are dificult to characterize using conventionalechniques. Advanced four-dimensional scanning transmission electron microscopy (4D-STEM), combiningspatially resolved diffraction with quantitative analysis methods, provides new opportunities for studying thesecomplex structures. Electron pair distribution function (ePDF) analysis enables mapping of local atomicarrangements, while diffraction-based strain analysis and Lorentz 4D-STEM reveal nanoscale strain fields andnagnetic configurations. Using Fe-based metallic glasses as examples, 4D-STEM combined with machineearning identifies distinct atomic packing characteristics and reveals the evolution of structural heterogeneityduring relaxation and deformation. Integrated ePDF and strain mapping further uncovers the relationship betweenocal atomic structures and shear-band-induced strain fields. The approach is also extended to amorphous SiCN,where in-situ 4D-STEM enables direct observation of temperature-dependent bonding evolution. These resulisdemonstrate that advanced 4D-STEM provides a powerful quantitative approach for revealing nanoscalestructure-property relationships in amorphous and structurally complex materials.

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