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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Trybel, Florian
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (5/5 displayed)
- 2024High‐Pressure Synthesis of Ultra‐Incompressible, Hard and Superconducting Tungsten Nitridescitations
- 2023Structure determination of ζ-N2 from single-crystal X-ray diffraction and theoretical suggestion for the formation of amorphous nitrogencitations
- 2022Synthesis of Ultra-Incompressible Carbon Nitrides Featuring Three-Dimensional Frameworks of CN4 Tetrahedra Recoverable at Ambient Conditions
- 2022High-pressure synthesis of seven lanthanum hydrides with a significant variability of hydrogen contentcitations
- 2020Proton mobility in metallic copper hydride from high-pressure nuclear magnetic resonancecitations
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article
High‐Pressure Synthesis of Ultra‐Incompressible, Hard and Superconducting Tungsten Nitrides
Abstract
<jats:title>Abstract</jats:title><jats:p>Transition metal nitrides, particularly those of 5<jats:italic>d</jats:italic> 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 W<jats:sub>2</jats:sub>N<jats:sub>3</jats:sub> and W<jats:sub>3</jats:sub>N<jats:sub>5</jats:sub>, are successfully synthesized at 35 and 56 GPa, respectively, through a direct reaction between N<jats:sub>2</jats:sub> and W in laser‐heated diamond anvil cells. Their crystal structure is determined using synchrotron single‐crystal X‐ray diffraction. While the W<jats:sub>2</jats:sub>N<jats:sub>3</jats:sub> solid's sole constituting nitrogen species are N<jats:sup>3‐</jats:sup> units, W<jats:sub>3</jats:sub>N<jats:sub>5</jats:sub> features both discrete N<jats:sup>3‐</jats:sup> as well as N<jats:sub>2</jats:sub><jats:sup>4‐</jats:sup> pernitride anions. The bulk modulus of W<jats:sub>2</jats:sub>N<jats:sub>3</jats:sub> and W<jats:sub>3</jats:sub>N<jats:sub>5</jats:sub> is experimentally determined to be 380(3) and 406(7) GPa, and their ultra‐incompressible behavior is rationalized by their constituting WN<jats:sub>7</jats:sub> polyhedra and their linkages. Importantly, both W<jats:sub>2</jats:sub>N<jats:sub>3</jats:sub> and W<jats:sub>3</jats:sub>N<jats:sub>5</jats:sub> are recoverable to ambient conditions and stable in air. Density functional theory calculations reveal W<jats:sub>2</jats:sub>N<jats:sub>3</jats:sub> and W<jats:sub>3</jats:sub>N<jats:sub>5</jats:sub> 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 W<jats:sub>2</jats:sub>N<jats:sub>3</jats:sub> corroborate with the calculations.</jats:p>