MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Crystal Structure of Fe-N Clusters Prepared by Plasma-Gas-Condensation
Dong-Liang PengTakehiko HiharaKenji Sumiyama
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2003 Volume 44 Issue 4 Pages 677-680

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Abstract

Fe–N clusters were prepared by a plasma-gas-condensation cluster deposition apparatus at various nitrogen gas flow rate RN2, and their crystal structures were investigated by transmission electron microscopy. For RN2>2.2×10−7 mol/s, fcc single-phase FeN clusters are obtained and their lattice parameter is a=0.428 nm, being close to that (a=0.433 nm) of ZnS-type FeN films. When RN2≥7.5×10−7 mol/s, almost all clusters are of a tetrahedron shape with cluster sizes of d=8–25 nm. This reveals that the tetrahedron shape of FeN compound clusters is stable in such small sizes, implying a low (111) surface energy and/or high elastic strain energy and twin boundary energy compared with pure metal clusters with fcc structure.

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© 2003 The Japan Institute of Metals and Materials
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