Titelangaben
Liang, Akun ; Osmond, Israel ; Krach, Georg ; Shi, Lan-Ting ; Brüning, Lukas ; Ranieri, Umbertoluca ; Spender, James ; Tasnadi, Ferenc ; Massani, Bernhard ; Stevens, Callum R. ; McWilliams, Ryan Stewart ; Bright, Eleanor Lawrence ; Giordano, Nico ; Gallego-Parra, Samuel ; Yin, Yuqing ; Aslandukov, Andrii ; Akbar, Fariia Iasmin ; Gregoryanz, Eugene ; Huxley, Andrew ; Peña-Alvarez, Miriam ; Si, Jian-Guo ; Schnick, Wolfgang ; Bykov, Maxim ; Trybel, Florian ; Laniel, Dominique:
High-Pressure Synthesis of Ultra-Incompressible, Hard and Superconducting Tungsten Nitrides.
In: Advanced Functional Materials.
Bd. 34
(2024)
Heft 32
.
- 2313819.
ISSN 1616-3028
DOI: https://doi.org/10.1002/adfm.202313819
Abstract
Transition metal nitrides, particularly those of 5d metals, are known for their outstanding properties, often relevant for industrial applications. Among these metal elements, tungsten is especially attractive given its low cost. In this high-pressure investigation of the W–N system, two novel ultra-incompressible tungsten nitride superconductors, namely W2N3 and W3N5, are successfully synthesized at 35 and 56 GPa, respectively, through a direct reaction between N2 and W in laser-heated diamond anvil cells. Their crystal structure is determined using synchrotron single-crystal X-ray diffraction. While the W2N3 solid's sole constituting nitrogen species are N3- units, W3N5 features both discrete N3- as well as N24- pernitride anions. The bulk modulus of W2N3 and W3N5 is experimentally determined to be 380(3) and 406(7) GPa, and their ultra-incompressible behavior is rationalized by their constituting WN7 polyhedra and their linkages. Importantly, both W2N3 and W3N5 are recoverable to ambient conditions and stable in air. Density functional theory calculations reveal W2N3 and W3N5 to have a Vickers hardness of 30 and 34 GPa, and superconducting transition temperatures at ambient pressure (50 GPa) of 11.6 K (9.8 K) and 9.4 K (7.2 K), respectively. Additionally, transport measurements performed at 50 GPa on W2N3 corroborate with the calculations.
Weitere Angaben
Publikationsform: | Artikel in einer Zeitschrift |
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Begutachteter Beitrag: | Ja |
Keywords: | high hardness; high-pressure synthesis; single-crystal X-ray diffraction; tungsten nitrides; ultra-incompressible |
Institutionen der Universität: | Forschungseinrichtungen > Zentrale wissenschaftliche Einrichtungen > Bayerisches Forschungsinstitut für Experimentelle Geochemie und Geophysik - BGI |
Titel an der UBT entstanden: | Ja |
Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften, Geologie |
Eingestellt am: | 30 Mai 2025 07:50 |
Letzte Änderung: | 30 Mai 2025 07:50 |
URI: | https://eref.uni-bayreuth.de/id/eprint/93801 |