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Cluster sizes with closed-shell structures always have first-order-like phase transitions. Almost one-third of cluster sizes in the analyzed range exhibit second-order-like phase transitions due to the presence of multiple structural configurations close in energy. 1-shell clusters with one to a few more atoms than a neighboring closed-shell structure have very low surface melting points and very high energetic melting points compared to their closed-shell counterparts. In clusters above 50 atoms with certain core structures, melting of the surface before the core was observed.<\/jats:p>","DOI":"10.1063\/5.0236122","type":"journal-article","created":{"date-parts":[[2025,4,7]],"date-time":"2025-04-07T09:54:50Z","timestamp":1744019690000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":1,"title":["Size-dependent second-order-like phase transitions in Fe nanocluster melting from low-temperature structural isomerization"],"prefix":"10.1063","volume":"162","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1251-8208","authenticated-orcid":false,"given":"Louis E. 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