Angewandte Chemie - International Edition
Angewandte Chemie - International Edition
5 years ago

High-Pressure NiAs-Type Modification of FeN

High-Pressure NiAs-Type Modification of FeN
Lev G. Akselrud, Leonid Dubrovinsky, Ilya Kupenko, Rainer Niewa, Richard Dronskowski, Maxim Bykov, Ulrich Schwarz, William P. Clark, Simon Steinberg, Catherine McCammon
The combination of laser-heated diamond anvil cells and synchrotron Mössbauer source spectroscopy were used to investigate high-temperature high-pressure chemical reactions of iron and iron nitride Fe2N with nitrogen. At pressures between 10 and 45 GPa, significant magnetic hyperfine splitting indicated compound formation after annealing at 1300 K. Subsequent in situ X-ray diffraction reveals a new modification of FeN with NiAs-type crystal structure, as also rationalized by first-principles total-energy and chemical-bonding studies. Pressing for change: The reaction of 57Fe and ζ-57Fe2N with nitrogen, above 1000 K and up to 45 GPa, is investigated using laser-heated diamond anvil cells and synchrotron Mössbauer source spectroscopy. After annealing at pressures larger than 10 GPa a new phase is observed, which shows pronounced magnetic hyperfine splitting. X-ray diffraction measurements using synchrotron radiation are consistent with NiAs-type FeN remaining present down to atmospheric pressure.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201702440

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