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Fe-N system at high pressure reveals a compound featuring polymeric nitrogen chains
Univ Bayreuth, Germany.
Univ Bayreuth, Germany; DESY, Germany.
Univ Bayreuth, Germany.
DESY, Germany.
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2018 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 9, article id 2756Article in journal (Refereed) Published
Abstract [en]

Poly-nitrogen compounds have been considered as potential high energy density materials for a long time due to the large number of energetic N-N or N=N bonds. In most cases high nitrogen content and stability at ambient conditions are mutually exclusive, thereby making the synthesis of such materials challenging. One way to stabilize such compounds is the application of high pressure. Here, through a direct reaction between Fe and N-2 in a laser-heated diamond anvil cell, we synthesize three ironnitrogen compounds Fe3N2, FeN2 and FeN4. Their crystal structures are revealed by single-crystal synchrotron X-ray diffraction. Fe3N2, synthesized at 50 GPa, is isostructural to chromium carbide Cr3C2. FeN2 has a marcasite structure type and features covalently bonded dinitrogen units in its crystal structure. FeN4, synthesized at 106 GPa, features polymeric nitrogen chains of [N-4(2-)](n) units. Based on results of structural studies and theoretical analysis, [N-4(2-)](n) units in this compound reveal catena-poly[tetraz-1-ene-1,4-diyl] anions.

Place, publisher, year, edition, pages
NATURE PUBLISHING GROUP , 2018. Vol. 9, article id 2756
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-150266DOI: 10.1038/s41467-018-05143-2ISI: 000438684200008PubMedID: 30013071OAI: oai:DiVA.org:liu-150266DiVA, id: diva2:1239747
Note

Funding Agencies|National Science Foundation-Earth Sciences [EAR-1634415]; Department of Energy-GeoSciences [DE-FG02-94ER14466]; DOE Office of Science [DE-AC02-06CH11357]; Deutsche Forschungsgemeinschaft (DFG) [DU 954-11/1, DU 393-10/1]; Federal Ministry of Education and Research, Germany (BMBF) [5K16WC1]; Swedish Research Council [2015-04391]; VINN Excellence Center Functional Nanoscale Materials (FunMat-2) [2016-05156]; Swedish Government Strategic Research Areas in Materials Science on Functional Materials at Linkoping University [2009-00971]; Swedish e-Science Research Centre (SeRC); Ministry of Education and Science of the Russian Federation [14.Y26.31.0005, K2-2017-080]; RFBR [16-02-00797]

Available from: 2018-08-17 Created: 2018-08-17 Last updated: 2018-09-10

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