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High‐Pressure High‐Temperature Synthesis of ϵ‐Fe 2 IrN 0.24
Author(s) -
Guo Kai,
Rau Dieter,
Schnelle Walter,
Burkhardt Ulrich,
Niewa Rainer,
Schwarz Ulrich
Publication year - 2014
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201300609
Subject(s) - analytical chemistry (journal) , materials science , antiferromagnetism , metal , iridium , annealing (glass) , nitride , nitrogen , thermogravimetric analysis , high pressure , magnetic susceptibility , atmospheric temperature range , phase (matter) , molar ratio , chemistry , crystallography , metallurgy , thermodynamics , nanotechnology , biochemistry , physics , organic chemistry , chromatography , layer (electronics) , condensed matter physics , catalysis
A high‐pressure high‐temperature synthesis involving initial reaction, nitrogen depletion and annealing yields a new ϵ‐type iron iridium nitride. Energy dispersive X‐ray spectroscopy of metallographic samples evidence a main phase having a molar metal ratio of Fe:Ir = 2:1 within experimental error. Chemical analyses and thermogravimetric measurements quantify the nitrogen content to 1.07 wt % ( x = 0.24) and 1.2 wt % ( x = 0.27), respectively. Above 750 K, the phase Fe 2 IrN 0.24 decomposes into solid solutions ϵ‐Fe(Ir) and γ‐Fe(Ir) involving the release of N 2 at ambient pressure. Magnetic susceptibility data suggest long‐range antiferromagnetic ordering at T N = 27 K.
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