| People | Locations | Statistics |
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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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Gregoryanz, Eugene
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (13/13 displayed)
- 2024High‐Pressure Synthesis of Ultra‐Incompressible, Hard and Superconducting Tungsten Nitridescitations
- 2023Synthesis and characterization of XeAr$_2$ under high pressurecitations
- 2023Pressure-Induced Metallization of BaH$_2$ and the Effect of Hydrogenation
- 2021High-Pressure Insertion of Dense $H_2$ into a Model Zeolitecitations
- 2020Pressure-induced amorphization and existence of molecular and polymeric amorphous forms in dense SO$_2$citations
- 2019Reactivity of lithium and platinum at elevated densitiescitations
- 2019Praseodymium polyhydrides synthesized at high temperatures and pressurescitations
- 2018Unusually complex phase of dense nitrogen at extreme conditionscitations
- 2018Structures of lithium-zinc compounds at high pressurescitations
- 2013Hydrogen at extreme pressures (Review Article)
- 2013High-Pressure Synthesis and Characterization of Iridium Trihydridecitations
- 2005Synthesis of superhard materialscitations
- 2004Synthesis and characterization of a binary noble metal nitride.citations
Places of action
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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>