Figure 58.

Mechanical properties of CrCl₃ and CrI₃. (a) Optical microscopy images of 2L and few layers CrCl₃ and Crl₃ suspended over microwells (600 nm in diameter) on a SiO₂/Si substrate. (b) Load–displacement curves and the corresponding fittings of 2L and 7L CrCl₃ and CrI₃. (c) Volumetric Young’s modulus and breaking strength of 2–10L CrCl₃ and CrI₃, along with dashed lines that show the linear fits. (d) Demonstration of the good plasticity of bulk CrCl₃ and CrI₃ crystals via folding them into rings. (e) Deformability factor versus Young modulus, where I, II, and III correspond to plastic-flexible, potentially deformable and brittle-rigid regions, respectively. The experiential results of CrCl₃ and CrI₃ are shown as red-filled circles, and the other layered vdW materials are shown as green filled circles. (f) Deformability factor versus bandgap for the same materials as in (e), and the materials that may show exceptional plastic behavior are shown in the dashed line encircled green area.⁶⁵⁹ All panels are adapted with permission from ref (659). Copyright 2021 American Chemical Society.