Projects per year
Abstract / Description of output
At pressures above a megabar (100 GPa), sodium crystallizes in a number of complex crystal structures with unusually low melting temperatures, reaching as low as 300 K at 118 GPa. We have utilized this unique behavior at extreme pressures to grow a single crystal of sodium at 108 GPa, and have investigated the complex crystal structure at this pressure using high-intensity x-rays from the new Diamond synchrotron source, in combination with a pressure cell with wide angular apertures. We confirm that, at 108 GPa, sodium is isostructural with the c/16 phase of lithium, and we have refined the full crystal structure of this phase. The results demonstrate the extension of single-crystal structure refinement beyond 100 GPa and raise the prospect of successfully determining the structures of yet more complex phases reported in sodium and other elements at extreme pressures.
|Number of pages||3|
|Journal||Proceedings of the National Academy of Sciences (PNAS)|
|Publication status||Published - 30 Oct 2007|
Keywords / Materials (for Non-textual outputs)
- alkali metals
- crystal structure
- high pressure
- HIGH-PRESSURE PHASES
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- 1 Finished
Lattice dynamical, electronic and structural properties of complex metals at extreme conditions. Advanced Fellowship
1/10/07 → 30/09/12