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. 2023 Nov 17;18(1):143. doi: 10.1186/s11671-023-03924-3

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Fig. 3 — a The two-step break-out in a Pb₁₄₇Al₁₉₁₁ nanocluster. Some of the core atoms are squeezed out, while the rest of the core remains inside the shell. b The core atoms will eventually break out at a higher temperature. Panels (c, d) show the core atoms corresponding to (a, b)