Nanoscale Phase Transformations in Functional Materials

Waitz, Thomas; Schranz, W.; Tröster, A.

doi:10.1007/978-3-642-55375-2_2

Cited by 2 publications

(1 citation statement)

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“…The structural phase transition of materials after applying external stimuli is often accompanied by dramatic changes of physical properties. − To understand the mechanism of phase transition and provide insights of structure–property relationships, the clarification of crystal structures with atomic precision is of much necessity. The atomic-level three-dimensional crystal structure determinations have mainly relied on single-crystal X-ray diffraction (SCXRD), which requires samples with a large crystal size.…”

Section: Introductionmentioning

confidence: 99%

In Situ Three-Dimensional Electron Diffraction for Probing Structural Transformations of Single Nanocrystals

Yang

et al. 2022

Chem. Mater.

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Phase transitions of materials are usually accompanied by a remarkable change of properties. Tracing and identifying the structural changes at the atomic scale is the key to understanding the fundamental mechanisms behind their performances. However, the direct observation of three-dimensional structural transformations in single nanocrystals has been rarely achieved. Herein we reported the development of an in situ threedimensional electron diffraction (3D ED) approach for single nanocrystal structural analysis by combining 3D ED with in situ transmission electron microscopy. Each data set covering a crystal tilting range of 50°was collected in around 1 min at the set temperature using an in situ heating holder. The feasibility of this protocol was proved by its successful application in investigating the metal−insulator transition (MIT) of vanadium dioxide (VO 2 ) crystals with atomic precision. Moreover, local domains were found in the monoclinic phase before and after the annealing process, of which the orientations obey a 4-fold rotation symmetry along the a-axis.

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