Synthesis of Sodium Polyhydrides at High Pressures

Overview

Journal Nat Commun

Specialty Biology

Date 2016 Jul 29

PMID 27464650

Citations 12

Authors

Viktor V Struzhkin

Duck Young Kim

Elissaios Stavrou

Takaki Muramatsu

Ho-Kwang Mao

Chris J Pickard

Richard J Needs

Vitali B Prakapenka

Alexander F Goncharov

Affiliations

Soon will be listed here.

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.

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