The hardness of silicon is known to be nearly independent of temperature below a certain transition point, and to decrease steeply thereafter. Based on high-temperature Berkovich nanoindentation at 25-500 °C and Raman microanalysis of Vickers indentations produced in single-crystal silicon at 25-750 °C, we present evidence of a transformation into a high-pressure metallic Si phase during indentation at temperatures up to about 350 °C. We show that this transformation pressure determines silicon hardness below the transition temperature. We also report the temperature stability ranges of different metastable phases of silicon, including a new Si-XIII phase.
|Original language||English (US)|
|Number of pages||9|
|Journal||Reviews on Advanced Materials Science|
|State||Published - Mar 1 2008|
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics