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Effect of pressure on the structure of Fe–N alloys formed by solid-state reaction

Published online by Cambridge University Press:  31 January 2011

B. Yao ,
L. Liu ,
S. E. Liu ,
X. Hu  and
W. H. Su
B. Yao
Affiliation:
Department of Physics, Jilin University, Changchun, 136000, People's Republic China Department of Materials, Faculty of Science, National University of Singapore, 119260, Singapore
L. Liu
Affiliation:
Department of Physics, Jilin University, Changchun, 136000, People's Republic China
S. E. Liu
Affiliation:
Department of Physics, Jilin University, Changchun, 136000, People's Republic China
X. Hu
Affiliation:
Department of Materials, Faculty of Science, National University of Singapore, 119260, Singapore
W. H. Su
Affiliation:
Department of Physics, Jilin University, Changchun, 136000, People's Republic China
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Abstract

Fe–N alloys with crystalline structures different from those obtained at atmospheric pressure were produced by solid-state reaction between Fe and amorphous boron nitride under high pressure. Two new paramagnetic Fe–N phases were obtained at temperatures above 800 K under pressures between 2.0 and 4.0 GPa. One is of cubic structure with lattice constant of 6.114 Å, and another is of orthorhombic structure with lattice constants of a = 4 8.443, b = 4 4.749, and c 4 3.993 Å. ε–Fe3Nx with N contents of 18.1 to 21.4 at.%, which could not be obtained at atmospheric pressure, was produced at pressures of 3.0 to 4.0 GPa and temperatures of 690 to 800 K. The mechanism of formation of ε–Fe3Nx under high pressure is discussed.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 9 , September 2001 , pp. 2583 - 2590
Copyright
Copyright © Materials Research Society 2001

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