Precision mapping of equilibrium disclination strain in pentagonally twinned nanostructures

Cheng Z, Shi C, Zhao K, Engel M, Jones MR, Han Y (2025)

Publication Type: Journal article

Publication year: 2025

Journal

Science Advances American Association for the Advancement of Science

Book Volume: 11

Pages Range: eaea9781-

Journal Issue: 44

DOI: 10.1126/sciadv.aea9781

Abstract

Pentatwinned nanostructures are key to understanding the mechanical, chemical, and structural behavior of nanomaterials owing to their unique fivefold symmetry and lattice strain from a 7.35° disclination gap between {111} twin boundaries. However, the precise equilibrium strain distributions have remained unclear because of heterogeneity among individual particles, requiring statistical analysis across large sample populations. Here, we use nanobeam four-dimensional scanning transmission electron microscopy (4D-STEM) to extract averaged strain profiles from uniformly sized, shape-identical particles, achieving high-resolution, statistically robust insights beyond single-particle noise. The strain profiles reveal how tensile, shear, and rotational components collectively compensate for the angular deficit, with particle shape-dependent local variations highlighting the importance of morphological control in synthesis. By integrating in situ heating with 4D-STEM, we captured a previously unobserved strain relaxation pathway involving the formation of periodic partial dislocations that stabilizes the strain-relieved equilibrium state. This study establishes a quantitative framework for equilibrium strain in fivefold-twinned nanostructures and offers strain engineering strategies for tailored properties.

Authors with CRIS profile

Kaijie Zhao Professur für Modellierung von Selbstorganisationsprozessen Michael Engel Lehrstuhl für Multiscale Simulation of Particulate Systems (MSS)

Involved external institutions

Rice University US United States (USA) (US)

How to cite

APA:

Cheng, Z., Shi, C., Zhao, K., Engel, M., Jones, M.R., & Han, Y. (2025). Precision mapping of equilibrium disclination strain in pentagonally twinned nanostructures. Science Advances, 11(44), eaea9781-. https://doi.org/10.1126/sciadv.aea9781

MLA:

Cheng, Zhihua, et al. "Precision mapping of equilibrium disclination strain in pentagonally twinned nanostructures." Science Advances 11.44 (2025): eaea9781-.

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