High-pressure synthesis of ultraincompressible hard rhenium nitride pernitride Re2(N2)(N)2 stable at ambient conditions

Maxim Bykov (), Stella Chariton, Hongzhan Fei, Timofey Fedotenko, Georgios Aprilis, Alena V. Ponomareva, Ferenc Tasnádi, Igor A. Abrikosov (), Benoit Merle, Patrick Feldner, Sebastian Vogel, Wolfgang Schnick, Vitali B. Prakapenka, Eran Greenberg, Michael Hanfland, Anna Pakhomova, Hanns-Peter Liermann, Tomoo Katsura, Natalia Dubrovinskaia and Leonid Dubrovinsky
Additional contact information
Maxim Bykov: University of Bayreuth
Stella Chariton: University of Bayreuth
Hongzhan Fei: University of Bayreuth
Timofey Fedotenko: University of Bayreuth
Georgios Aprilis: University of Bayreuth
Alena V. Ponomareva: National University of Science and Technology ‘MISIS’
Ferenc Tasnádi: Linköping University
Igor A. Abrikosov: Linköping University
Benoit Merle: Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Martensstraβe. 5
Patrick Feldner: Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Martensstraβe. 5
Sebastian Vogel: University of Munich (LMU)
Wolfgang Schnick: University of Munich (LMU)
Vitali B. Prakapenka: University of Chicago
Eran Greenberg: University of Chicago
Michael Hanfland: European Synchrotron Radiation Facility
Anna Pakhomova: Photon Science, Deutsches Elektronen-Synchrotron
Hanns-Peter Liermann: Photon Science, Deutsches Elektronen-Synchrotron
Tomoo Katsura: University of Bayreuth
Natalia Dubrovinskaia: University of Bayreuth
Leonid Dubrovinsky: University of Bayreuth

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract High-pressure synthesis in diamond anvil cells can yield unique compounds with advanced properties, but often they are either unrecoverable at ambient conditions or produced in quantity insufficient for properties characterization. Here we report the synthesis of metallic, ultraincompressible (K0 = 428(10) GPa), and very hard (nanoindentation hardness 36.7(8) GPa) rhenium nitride pernitride Re2(N2)(N)2. Unlike known transition metals pernitrides Re2(N2)(N)2 contains both pernitride N24− and discrete N3− anions, which explains its exceptional properties. Re2(N2)(N)2 can be obtained via a reaction between rhenium and nitrogen in a diamond anvil cell at pressures from 40 to 90 GPa and is recoverable at ambient conditions. We develop a route to scale up its synthesis through a reaction between rhenium and ammonium azide, NH4N3, in a large-volume press at 33 GPa. Although metallic bonding is typically seen incompatible with intrinsic hardness, Re2(N2)(N)2 turned to be at a threshold for superhard materials.

Date: 2019
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DOI: 10.1038/s41467-019-10995-3

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