Fig. 5: The direction of principal strains.
a The 2D (upper) and 3D (lower) schematic diagram of (111) face and <111> face in the tetrahedron, marked by red and blue arrows, respectively. The direction of tensile strain (b), and compressive strain (c) in a tetrahedral domain, and the tensile strain is along the tangential direction of the tetrahedral crystal region ((111) face) while the direction of the compressive strain is along the radial direction of the tetrahedral crystal region (<111> face). The distribution of tensile strain (d) and the compressive strain (e) in a slice with thickness of 3 Å. The inset shows the position of the slice in ICNP-1. The histogram of tensile strain (pink) and compressive strain (light purple) along the tangential direction (eθ) and radial direction (er) in ICNP-1 (f) and SF configuration (g). The deep purple part shows the overlapping of tensile strain and compressive strain. Source data are provided as a Source Data file.
