Fcc-hcp phase transformation in Co nanoparticles induced by swift heavy-ion irradiation

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dc.contributor.authorSprouster, DJen_AU
dc.contributor.authorGiulian, Ren_AU
dc.contributor.authorSchnohr, CSen_AU
dc.contributor.authorAraujo, LLen_AU
dc.contributor.authorKluth, Pen_AU
dc.contributor.authorByrne, APen_AU
dc.contributor.authorForan, GJen_AU
dc.contributor.authorJohannessen, Ben_AU
dc.contributor.authorRidgway, MCen_AU
dc.date.accessioned2009-11-04T05:57:52Zen_AU
dc.date.accessioned2010-04-30T05:05:02Zen_AU
dc.date.available2009-11-04T05:57:52Zen_AU
dc.date.available2010-04-30T05:05:02Zen_AU
dc.date.issued2009-09en_AU
dc.date.statistics2009-09en_AU
dc.description.abstractWe demonstrate a face-centered cubic (fcc) to hexagonally close-packed (hcp) phase transformation in spherical Co nanoparticles achieved via swift heavy-ion irradiation. Co nanoparticles of mean diameter 13.2 nm and fcc phase were first formed in amorphous SiO2 by ion implantation and thermal annealing and then irradiated at room temperature with 9-185 MeV Au ions. The crystallographic phase was identified with x-ray absorption spectroscopy and electron diffraction and quantified, as functions of the irradiation energy and fluence, with the former. The transformation was complete at low fluence prior to any change in nanoparticle shape or size and was governed by electronic stopping. A direct-impact mechanism was identified with the transformation interaction cross-section correlated with that of a molten ion track in amorphous SiO2. We suggest the shear stress resulting from the rapid thermal expansion about an ion track in amorphous SiO2 was sufficient to initiate the fcc-to-hcp phase transformation in the Co nanoparticles. © 2009, American Physical Societyen_AU
dc.identifier.citationSprouster, D. J., Giulian, R., Schnohr, C. S., Araujo, L. L., Kluth, P., Byrne, A. P., Foran, G. J., Johannessen, B., & Ridgway, M. C. (2009). Fcc-hcp phase transformation in Co nanoparticles induced by swift heavy-ion irradiation. Physical Review B, 80(11), 5. doi:10.1103/PhysRevB.80.115438en_AU
dc.identifier.govdoc1328en_AU
dc.identifier.issn1098-0121en_AU
dc.identifier.issue11en_AU
dc.identifier.journaltitlePhysical Review Ben_AU
dc.identifier.pagination5en_AU
dc.identifier.urihttp://dx.doi.org/10.1103/PhysRevB.80.115438en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/2191en_AU
dc.identifier.volume80en_AU
dc.language.isoenen_AU
dc.publisherAmerican Physical Societyen_AU
dc.subjectCobalten_AU
dc.subjectIrradiationen_AU
dc.subjectHeavy ionsen_AU
dc.subjectPhase transformationsen_AU
dc.subjectMagnetic propertiesen_AU
dc.subjectScatteringen_AU
dc.titleFcc-hcp phase transformation in Co nanoparticles induced by swift heavy-ion irradiationen_AU
dc.typeJournal Articleen_AU
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