Sodium-potassium system at high pressure

Frost, Mungo; McBride, Emma E.; Schörner, Maximilian; Redmer, Ronald; Glenzer, Siegfried H.

doi:10.1103/PhysRevB.101.224108

Sodium-potassium system at high pressure

Journal Article · Tue Jun 09 00:00:00 EDT 2020 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.101.224108· OSTI ID:1630299

Frost, Mungo ^[1]; McBride, Emma E. ^[2]; Schörner, Maximilian ^[3]; ^[3]; Glenzer, Siegfried H. ^[2]

SLAC National Accelerator Lab., Menlo Park, CA (United States); SLAC
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Univ. of Rostock (Germany)

Mixtures of sodium and potassium differ substantially from the pure elements, while retaining the high compressibility which is important to the complex behaviour of dense alkali metals. We present powder x-ray diffraction of mixtures of Na and K compressed in diamond anvil cells to 48 GPa at 295 K. This reveals two stoichiometric intermetallics: an Na2K phase known at ambient pressure and low temperature, and a novel NaK phase formed of interpenetrating sodium and potassium diamond lattices. Density functional theory calculations find the new phase to be dynamically stable and, in contrast to pure alkali metals, reveal decreasing electron localisation with applied pressure. Depending on the mixture composition these intermetallics are accompanied by sodium or potassium rich phases suggesting that there are no other intermetallics under the range of P-T conditions studied. Alkali metal mixtures have seen little study at high pressure and represent an unusual class of materials with very high compressibility and multiple constituents. Such materials exhibit significant compression at experimentally accessible pressures and open a way to measure multi species structures at high compression. These results challenge structural finding algorithms for mixtures in high pressure conditions.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division

Grant/Contract Number:: AC02-06CH11357; AC02-76SF00515

OSTI ID:: 1630299

Alternate ID(s):: OSTI ID: 1633802
OSTI ID: 1637898

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 22 Vol. 101; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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