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.
|Number of pages||7|
|Journal||Physical review B: Condensed matter and materials physics|
|Publication status||Published - 17 May 2011|
- HIGH-PRESSURE PHASES