Lattice expansion in nonoxidized FePt nanoparticles: X-ray absorption measurements

被引：9

作者：

Antoniak, C. ^{[1
]}

Trunova, A.

Spasova, M.

Farle, M.

Wende, H.

Wilhelm, F. ^{[2
]}

Rogalev, A. ^{[2
]}

机构：

[1] Univ Duisburg Essen, Fachbereich Phys, D-47048 Duisburg, Germany

[2] European Synchrotron Radiat Facil, F-38043 Grenoble, France

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 04期

关键词：

D O I：

10.1103/PhysRevB.78.041406

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Wet-chemically synthesized FePt nanoparticles were structurally characterized not only in the as-prepared state but also after the removal of organic ligands and reduction in Fe oxides by a soft in situ hydrogen plasma treatment. By the analyses of the extended x-ray absorption fine structures at the Pt L(3) absorption edge, we found an enhanced lattice constant with respect to the bulk material for the oxide-free nanoparticles with clean surfaces. This shows that there exists a lattice expansion in FePt nanoparticles, which is an intrinsic property of the particles, and neither caused by Fe oxides at the surface nor by the organic ligands surrounding the nanoparticles in the as-prepared state. In addition, a first evidence of an inhomogeneous composition within the nanoparticles is given.

引用

页数：4

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