Swift heavy ion irradiation of cobalt nanoparticles

D. J. Sprouster; R. Giulian; C. S. Schnohr; P. Kluth; L. L. Araujo; A. P. Byrne; G. J. Foran; M. C. Ridgway

doi:10.1063/1.3086235

Swift heavy ion irradiation of cobalt nanoparticles

D. J. Sprouster, R. Giulian, C. S. Schnohr, P. Kluth, L. L. Araujo, A. P. Byrne, G. J. Foran, M. C. Ridgway

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Abstract

It is well known that the electronic energy loss released by swift heavy ions can cause considerable atomic movement in various solids. Here, we present a study of the effects of swift heavy ion irradiation on Co nanoparticles embedded within a silica host matrix. The evolution of the Co nanoparticle crystal phase, structural properties, shape and size has been characterized using a combination of x-ray absorption spectroscopy and transmission electron microscopy. An FCC-to-HCP phase transformation is observed at low fluences, while higher fluences result in significant changes in the short range order and NP shape. After an incubation fluence the nanoparticles deform into ellipsoids, preferentially aligned parallel to the incident beam direction. The threshold diameter for elongation was comparable to the saturation value of the ellipsoid width. We correlate this saturation value with the diameter of the molten track induced in amorphous silica by swift heavy ion irradiation.

Original language	English
Pages (from-to)	55-61
Number of pages	7
Journal	AIP Conference Proceedings
Volume	1092
DOIs	https://doi.org/10.1063/1.3086235
Publication status	Published - 2009
Event	6th International Conference on Synchrotron Radiation in Materials Science - Campinas, Sao Paulo, Brazil Duration: 20 Jul 2008 → 23 Jul 2008

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title = "Swift heavy ion irradiation of cobalt nanoparticles",

abstract = "It is well known that the electronic energy loss released by swift heavy ions can cause considerable atomic movement in various solids. Here, we present a study of the effects of swift heavy ion irradiation on Co nanoparticles embedded within a silica host matrix. The evolution of the Co nanoparticle crystal phase, structural properties, shape and size has been characterized using a combination of x-ray absorption spectroscopy and transmission electron microscopy. An FCC-to-HCP phase transformation is observed at low fluences, while higher fluences result in significant changes in the short range order and NP shape. After an incubation fluence the nanoparticles deform into ellipsoids, preferentially aligned parallel to the incident beam direction. The threshold diameter for elongation was comparable to the saturation value of the ellipsoid width. We correlate this saturation value with the diameter of the molten track induced in amorphous silica by swift heavy ion irradiation.",

keywords = "Co, NPs, Phase transformation, Swift heavy ion irradiation., TEM, XAS",

author = "Sprouster, {D. J.} and R. Giulian and Schnohr, {C. S.} and P. Kluth and Araujo, {L. L.} and Byrne, {A. P.} and Foran, {G. J.} and Ridgway, {M. C.}",

year = "2009",

doi = "10.1063/1.3086235",

language = "English",

volume = "1092",

pages = "55--61",

journal = "AIP Conference Proceedings",

issn = "0094-243X",

publisher = "American Institute of Physics",

note = "6th International Conference on Synchrotron Radiation in Materials Science ; Conference date: 20-07-2008 Through 23-07-2008",

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TY - JOUR

T1 - Swift heavy ion irradiation of cobalt nanoparticles

AU - Sprouster, D. J.

AU - Giulian, R.

AU - Schnohr, C. S.

AU - Kluth, P.

AU - Araujo, L. L.

AU - Byrne, A. P.

AU - Foran, G. J.

AU - Ridgway, M. C.

PY - 2009

Y1 - 2009

N2 - It is well known that the electronic energy loss released by swift heavy ions can cause considerable atomic movement in various solids. Here, we present a study of the effects of swift heavy ion irradiation on Co nanoparticles embedded within a silica host matrix. The evolution of the Co nanoparticle crystal phase, structural properties, shape and size has been characterized using a combination of x-ray absorption spectroscopy and transmission electron microscopy. An FCC-to-HCP phase transformation is observed at low fluences, while higher fluences result in significant changes in the short range order and NP shape. After an incubation fluence the nanoparticles deform into ellipsoids, preferentially aligned parallel to the incident beam direction. The threshold diameter for elongation was comparable to the saturation value of the ellipsoid width. We correlate this saturation value with the diameter of the molten track induced in amorphous silica by swift heavy ion irradiation.

AB - It is well known that the electronic energy loss released by swift heavy ions can cause considerable atomic movement in various solids. Here, we present a study of the effects of swift heavy ion irradiation on Co nanoparticles embedded within a silica host matrix. The evolution of the Co nanoparticle crystal phase, structural properties, shape and size has been characterized using a combination of x-ray absorption spectroscopy and transmission electron microscopy. An FCC-to-HCP phase transformation is observed at low fluences, while higher fluences result in significant changes in the short range order and NP shape. After an incubation fluence the nanoparticles deform into ellipsoids, preferentially aligned parallel to the incident beam direction. The threshold diameter for elongation was comparable to the saturation value of the ellipsoid width. We correlate this saturation value with the diameter of the molten track induced in amorphous silica by swift heavy ion irradiation.

KW - Co

KW - NPs

KW - Phase transformation

KW - Swift heavy ion irradiation.

KW - TEM

KW - XAS

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U2 - 10.1063/1.3086235

DO - 10.1063/1.3086235

M3 - Conference article

AN - SCOPUS:64849085455

SN - 0094-243X

VL - 1092

SP - 55

EP - 61

JO - AIP Conference Proceedings

JF - AIP Conference Proceedings

T2 - 6th International Conference on Synchrotron Radiation in Materials Science

Y2 - 20 July 2008 through 23 July 2008

ER -

Swift heavy ion irradiation of cobalt nanoparticles

Abstract

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