Optical and electronic properties of dense sodium

Year: 2011

Authors: Marques M., Santoro M., Guillaume C. L., Gorelli F. A., Contreras-Garcia J., Howie R. T., Goncharov A. F., Gregoryanz E.

Autors Affiliation: Centre for Science at Extreme Conditions and School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom; European Laboratory for Non-Linear Spectroscopy, University of Florence, I-50121 Florence, Italy; IPCF-CNR, UOS Roma, Piazzale Aldo Moro 5, 00185 Roma, Italy; Department of Chemistry, Duke University, Durham, North Carolina 27708, USA; Geophysical Laboratory, Carnegie Institution of Washington, Washington DC 20005 USA

Abstract: High-resolution Raman spectroscopy of dense sodium reveals additonal low-energy lattice excitations in the three high-pressure phases cI 16, oP 8, and tI 19 from 108 to 178 GPa. The Raman-active lattice modes indicate profound changes of the chemical bonding in Na upon its transformation to an insulating state (hP 4 phase) at pressures above 178( 2) GPa. The calculated values of the valence electron localization maxima versus pressure provide insights into the experimentally observed solid-solid phase transitions and anomalous melting behavior of sodium.

Journal/Review: PHYSICAL REVIEW B

Volume: 83 (18)      Pages from: 184106  to: 184106

More Information: We acknowledge financial support from the UK Engineering and Physical Sciences Research Council; the EU Contract No. FP7 G.A. No 228334 laserlabeurope; the Ente Cassa di Risparmio di Firenze, supporting research at LENS under the grant \”Firenze Hydrolab\”; the Spanish MALTA Consolider Project; and DOE/NNSA (CDAC), Army Research Office, and NSF Grant No. EAR-1015239.
DOI: 10.1103/PhysRevB.83.184106

Citations: 43
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