Shapes, multiple twins and surface structures of monodisperse FePt magnetic nanocrystals

被引:97
作者
Dai, ZR
Sun, SH
Wang, ZL [1 ]
机构
[1] Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA
[2] IBM Corp, Thomas J Watson Res Ctr, Yorktown Hts, NY 10598 USA
基金
美国国家科学基金会;
关键词
alloys; electron microscopy; polycrystalline surfaces;
D O I
10.1016/S0039-6028(02)01384-5
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Shapes, surface atomic arrangement and structural evolution induced by annealing of monodisperse FePt nanocrystals, synthesized by a solution phase chemical procedure, have been studied by high-resolution transmission electron microscopy. The as-synthesized FePt nanocrystals display dominantly a truncated octahedron shape enclosed by flat {100}, stepped {111} and zig-zag {110} facets. The Marks decahedron FePt nanocrystals and the icosahedron based multiply twined FePt nanocrystals are identified in the as-synthesized particles. An improved structural model has been proposed for the multiply twined nanocrystals. After annealing, the {110} facets disappear and a regular cuboctahedron becomes the dominant shape. Surfaces of the FePt nanocrystals show no reconstruction but with some atomic steps and kinks. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:325 / 335
页数:11
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