Abstract：
:Gold is a noble metal typically stable as a solid in a face-centered cubic (FCC) structure under ambient conditions; however, under particular circumstances aberrant allotropes have been synthesized. In this work, we document the phase transformation of 25 nm thick nanocrystalline (NC) free-standing gold thin-film via in situ ion irradiation studied using atomic-resolution transmission electron microscopy (TEM). Utilizing precession electron diffraction (PED) techniques, crystallographic orientation and the radiation-induced relative strains were measured and furthermore used to determine that a combination of surface and radiation-induced strains lead to an FCC to hexagonal close packed (HCP) crystallographic phase transformation upon a 10 dpa radiation dose of Au4+ ions. Contrary to previous studies, HCP phase in nanostructures of gold was stabilized and did not transform back to FCC due to a combination of size effects and defects imparted by damage cascades.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Suri PK,Nathaniel JE 2nd,Li N,Baldwin JK,Wang Y,Hattar K,Taheri MLdoi
10.1038/s41598-020-74779-2subject
Has Abstractpub_date
2020-10-20 00:00:00pages
17864issue
1issn
2045-2322pii
10.1038/s41598-020-74779-2journal_volume
10pub_type
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