Swift Heavy Ion Irradiation of Cobalt Nanoparticles

被引：0

作者：

Sprouster, D. J. ^{[1
]}

Giulian, R. ^{[1
]}

Schnohr, C. S. ^{[1
]}

Kluth, P. ^{[1
]}

Araujo, L. L. ^{[1
]}

Byrne, A. P. ^{[2
]}

Foran, G. J. ^{[3
]}

Ridgway, M. C. ^{[1
]}

机构：

[1] Australian Natl Univ, Dept Elect Mat Engn, GPO Box 4, Canberra, ACT 0200, Australia

[2] Australian Natl Univ, Coll Sci Frank Fenner Bldg, Canberra, ACT 0200, Australia

[3] Australian Nucl Sci & Technol Org, Menai, NSW 2234, Australia

来源：

SYNCHROTRON RADIATION IN MATERIALS SCIENCE | 2009年 / 1092卷

关键词：

Co; NPs; XAS; TEM; phase transformation; swift heavy ion irradiation;

D O I：

10.1063/1.3086235

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页码：55 / +

页数：2

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