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, Leonid Dubrovinsky

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Apr 09, 2019
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Received Date: 17th March 19

High-pressure synthesis can yield unique compounds with advanced properties, but usually they are either unrecoverable at ambient conditions or produced in quantity insufficient for properties characterization. Here we report the synthesis of metallic, ultraincompressible (bulk modulus K0 = 428(10) GPa), and very hard (nanoindentation hardness 36.7(8) GPa) rhenium (V) nitride pernitride Re2(N2)N2. First it was obtained through a direct reaction between rhenium and nitrogen at 40 to 90 GPa in a laser-heated diamond anvil cell. The synthesis was scaled up through a reaction between rhenium and ammonium azide in a large-volume press at 33 GPa. Although metallic bonding is typically seen incompatible with intrinsic hardness, Re2(N2)N2 turned to be at a threshold for superhard materials. Our work demonstrates a feasibility of surmounting conceptions common in material sciences.

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This is an abstract of a preprint hosted on an independent third party site. It has not been peer reviewed but is currently under consideration at Nature Communications.

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