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Electron-diffraction study on ∈-iron nitride powders with various nitrogen contents: Variation of long-range nitrogen ordering

Published online by Cambridge University Press:  03 March 2011

Z.Q. Liu ,
A. Leineweber ,
E.J. Mittemeijer ,
K. Mitsuishi  and
K. Furuya
Z.Q. Liu
Affiliation:
High Voltage Electron Microscopy Station, National Institute for Materials Science, Tsukuba 305-0003, Japan
A. Leineweber*
Affiliation:
Max Planck Institute for Metals Research, D-70569 Stuttgart, Germany
E.J. Mittemeijer
Affiliation:
Max Planck Institute for Metals Research, D-70569 Stuttgart, Germany
K. Mitsuishi
Affiliation:
High Voltage Electron Microscopy Station, National Institute for Materials Science, Tsukuba 305-0003, Japan
K. Furuya
Affiliation:
High Voltage Electron Microscopy Station, National Institute for Materials Science, Tsukuba 305-0003, Japan
*
a) Address all correspondence to this author. e-mail: a.leineweber@mf.mpg.de
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Abstract

Homogeneous ∈-iron nitride powder particles of the compositions Fe3N1.00, Fe3N1.22, Fe3N1.30, and Fe3N1.39 were investigated using selected-area electron diffraction. The superstructure reflections, due to N ordering on the octahedral interstitial sites of a hexagonal close-packed (hcp) arrangement of Fe, indicate a hexagonal supercell with a′ = 31/2ahcp, c′ = chcp for all cases; P6322 space group symmetry for Fe3N1.00, Fe3N1.30, and Fe3N1.39; and lower symmetry (P312) for Fe3N1.22 and some of the Fe3N1.30 particles. Recognition of the occurrence of double diffraction is essential for correct interpretation of the diffraction patterns. Additionally, diffuse scattering by some of the Fe3N1.39 grains was observed.

Keywords

Crystallographic structureNitrideTransmission electron microscopy (TEM)
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 10 , October 2006 , pp. 2572 - 2581
Copyright
Copyright © Materials Research Society 2006

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