Author:
Suri Pranav K.,Nathaniel James E.,Li Nan,Baldwin Jon K.,Wang Yongqiang,Hattar Khalid,Taheri Mitra L.
Abstract
AbstractGold 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.
Funder
U.S. Department of Energy
National Nuclear Security Administration
National Nuclear Security Administration,United States
Publisher
Springer Science and Business Media LLC
Cited by
6 articles.
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