A Novel Dual-Step Nucleation Pathway in Crystalline Solids under Neutron Irradiation

Meher, Subhashish; van Rooyen, Isabella J.; Lillo, Thomas M.

doi:10.1038/s41598-017-18548-8

Title: A Novel Dual-Step Nucleation Pathway in Crystalline Solids under Neutron Irradiation

Journal Article · Mon Jan 08 00:00:00 EST 2018 · Scientific Reports

DOI:https://doi.org/10.1038/s41598-017-18548-8· OSTI ID:1469359

^[1]; van Rooyen, Isabella J. ^[1]; Lillo, Thomas M. ^[1]

Idaho National Lab. (INL), Idaho Falls, ID (United States)

Innovations in nanostructuring of inorganic crystalline solids are often limited by prerequisite critical nucleation energy and solute supersaturation for formation of a phase. This research provides direct evidence supporting the viability of an unconventional irradiation-induced nanostructuring process, via transmission electron microscopy, that circumvents these preconditions. Using polymorphic silicon carbide (SiC) as a prototype, a surprising two-step nucleation route is demonstrated through which nanoscale distribution of the second phase is achieved by reaction of solutes with neutron irradiation-induced precursors. In the first step, nanoscale α–SiC precipitates in a β–SiC matrix unexpectedly nucleate heterogeneously at structural defects. This occurs at significantly lower temperatures compared with the usual β→α transition temperature. Subsequently, α–SiC precipitate acts as a surrogate template for its structural and compositional transition into a fission product precipitate, palladium silicide. These discoveries provide a modern view of irradiation engineering in polymorphic ceramics for advanced applications.

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Research Organization:: Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Contributing Organization:: EMN-HyMARC

Grant/Contract Number:: AC07-05ID14517

OSTI ID:: 1469359

Report Number(s):: INL/JOU-17-42957-Rev000; PII: 18548

Journal Information:: Scientific Reports, Vol. 8, Issue 1; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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