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Title: Fcc-hcp phase transformation in Co nanoparticles induced by swift heavy-ion irradiation.
Authors: Sprouster, DJ
Giulian, R
Schnohr, CS
Araujo, LL
Kluth, P
Byrne, AP
Foran, GJ
Johannessen, B
Ridgway, MC
Keywords: Cobalt
Heavy Ions
Phase transformations
Magnetic properties
Issue Date: Sep-2009
Publisher: American Physical Society
Citation: Sprouster, 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.80.115438
Abstract: We 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 Society
Gov't Doc #: 1328
ISSN: 1098-0121
Appears in Collections:Journal Articles

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