Struzhkin, VV;
Kim, DY;
Stavrou, E;
Muramatsu, T;
Mao, H-K;
Pickard, CJ;
Needs, RJ;
... Goncharov, AF; + view all
(2016)
Synthesis of sodium polyhydrides at high pressures.
NATURE COMMUNICATIONS
, 7
, Article 12267. 10.1038/ncomms12267.
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Abstract
The only known compound of sodium and hydrogen is archetypal ionic NaH. Application of high pressure is known to promote states with higher atomic coordination, but extensive searches for polyhydrides with unusual stoichiometry have had only limited success in spite of several theoretical predictions. Here we report the first observation of the formation of polyhydrides of Na (NaH3 and NaH7) above 40 GPa and 2,000 K. We combine synchrotron X-ray diffraction and Raman spectroscopy in a laser-heated diamond anvil cell and theoretical random structure searching, which both agree on the stable structures and compositions. Our results support the formation of multicenter bonding in a material with unusual stoichiometry. These results are applicable to the design of new energetic solids and high-temperature superconductors based on hydrogen-rich materials.
| Type: | Article |
|---|---|
| Title: | Synthesis of sodium polyhydrides at high pressures |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1038/ncomms12267 |
| Publisher version: | http://dx.doi.org/10.1038/ncomms12267 |
| Additional information: | This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1458238 |
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