Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session H71: Poster Session I (2:00pm - 4:00pm)
2:00 PM,
Tuesday, March 16, 2021
Abstract: H71.00240 : Compression of Heavy Alkali Metals at Multi-Megabar Pressures*
Presenter:
Christian Storm
(Univ of Edinburgh)
Authors:
Christian Storm
(Univ of Edinburgh)
Sarah Finnegan
(Univ of Edinburgh)
Edward Pace
(Univ of Edinburgh)
Michael Stevenson
(Univ of Edinburgh)
James McHardy
(Univ of Edinburgh)
Simon MacLeod
(AWE)
Malcolm McMahon
(Univ of Edinburgh)
incommensurate host-guest structures become favourable in K at 20 GPa and Rb at 16 GPa. These two elements are also predicted to mirror the transitions of Cs at increasing pressures, I41 / amd → Cmca → dhcp.
We present an exploration Rb at pressures up to 250 GPa, discussing the challenges involved in studying these highly reactive elements in diamond anvil cells. We further discuss the transition to dhcp phase, and comment on the bizarre compressive behaviour caused by the plethora of phase changes in these ‘simple’ metals.
*This work was supported by the Engineering and Physical Sciences Research Council (EPSRC UK) and AWE.
©British Crown Owned Copyright 2020/AWE. Published with permission of the Controller of Her Britannic Majesty’s Stationary Office.
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