Abstract
In the present work homogeneous epsilon-nitride powders prepared
at 723 K, having nitrogen contents ranging from 26.1 at. % N
(z=0.29) to 31.1 at.% N (z=0.10), were investigated with X-ray
diffraction (XRD) and Mössbauer spectroscopy. A thermodynamic
model accounting for the two possible configurations of LRO of the
N atoms was fitted to the N-absorption isotherm at 723 K and
resulted in the occupancies of the sites of the nitrogen
sublattice. A miscibility gap between configurations A and B was
predicted. The XRD results did not allow for an unambiguous
identification of configuration A, because the discriminating
superstructure reflections (with respect to h.c.p. Fe) associated
with configuration A were not observed. On the other hand, the
probabilities of Fe atoms surrounded by 1 up to 3 N atoms, as
derived from the Mössbauer spectra, are consistent with the
distribution of nitrogen over the available sites and the
occurrence of a two phase region A+B as predicted by the model.
The discrepancy between XRD and Mössbauer results is discussed in
terms of a reason for extinguished superstructure reflections in
the X-ray diffractogram of configuration A.
Original language | English |
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Title of host publication | Materials Science Forum, vols. 318-320 |
Place of Publication | Switzerland |
Publisher | Trans Tech Publications |
Publication date | 1999 |
Pages | 115-120 |
Publication status | Published - 1999 |
Event | High Nitrogen Steels 98 - Stockholm-Helsinki Duration: 1 Jan 1998 → … |
Conference
Conference | High Nitrogen Steels 98 |
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City | Stockholm-Helsinki |
Period | 01/01/1998 → … |