Songet al.,Science 367 ,40–45 (2020) 3 January 2020 2of6
Fig. 2. 5-FT formation mechanism 1 through OA,
atomic surface diffusion, and after nucleation
and growth of ZST.(AandB) Formation of
S 32 and ~90° concave surface after the OA process.
(C) Migration of atoms to the concave surface
region (blue arrow) with the formation of theS9GB
andS 32 migration of two atomic layers toward
region III from II. (DtoG) Oscillation between
S27-(200)IandS27-(111)IVand correspondinga.
(H) Nucleation of ZST onS27 near the twin pole.
(I) Formation of 5-FT. The red arrowhead in
(G) denotes one layer of twin interface through
partial dislocation slipping.Fig. 3.S27 oscillatory evolution process
before the 5-FT formation.(AandB) Enlarged
high-resolution TEM images of the NP in
Fig. 2 showingaoscillation. (C) Theoretical
angle misfit between (200)Iand (111)IV.
(DtoF) Variation ofa,bI,bII, andbIIIwith
time. Approximately 20 to 80 measurements
were taken for each data point in Fig. 3E.
SE, standard error. (GandH) Atomic structure
and energy profile of the whole NP during the
oscillatory evolution process ofS27 based
on MD simulation, respectively.RESEARCH | RESEARCH ARTICLE