Stabilization of Polynitrogen Anions in Tantalum–Nitrogen Compounds at High Pressure
Abstract
The synthesis of polynitrogen compounds is of great importance due to their potential as high‐energy‐density materials (HEDM), but because of the intrinsic instability of these compounds, their synthesis and stabilization is a fundamental challenge. Polymeric nitrogen units which may be stabilized in compounds with metals at high pressure are now restricted to non‐branched chains with an average N−N bond order of 1.25, limiting their HEDM performances. Herein, we demonstrate the synthesis of a novel polynitrogen compound TaN5 via a direct reaction between tantalum and nitrogen in a diamond anvil cell at circa 100 GPa. TaN5 is the first example of a material containing branched all‐single‐bonded nitrogen chains [N55−]∞. Apart from that we discover two novel Ta–N compounds: TaN4 with finite N44− chains and the incommensurately modulated compound TaN2−x, which is recoverable at ambient conditions.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 10, 2021
- Source ID
- 10.1002/anie.202100283
Entities
People
- Alena V. Ponomareva
- Alexander Goncharov
- Elena Bykova
- Igor A. Abrikosov
- Leonid Dubrovinsky
- Maxim Bykov
- Mohammad F. Mahmood
- Stella Chariton
- Vitali Prakapenka
Organizations
- Federal Ministry of Research, Technology and Space
- German Research Foundation
- Howard University
- Knut and Alice Wallenberg Foundation
- Linköping University
- National University of Science and Technology
- Russian Science Foundation
- Swedish Research Council
- United States Army Research Laboratory
- University of Chicago