Pressure-dependent phase transition of 2D layered silicon telluride (Si2Te3) and manganese intercalated silicon telluride
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2019-04-02 |
| Journal | Nano Research |
| Authors | Virginia L. Johnson, Auddy Anilao, Kristie J. Koski |
| Institutions | University of California, Davis |
| Citations | 20 |
Abstract
Section titled āAbstractāTwo-dimensional (2D) layered silicon telluride (Si2Te3) nanocrystals were compressed to 12 GPa using diamond anvil cell techniques. Optical measurements show a color change from transparent red to opaque black indicating a semiconductor-to-metal phase transition. Raman scattering was used to observe the stiffening of the crystal lattice and subsequent phase behavior. A possible phase transition was observed at 9.5 Ā± 0.5 GPa evidenced by the disappearance of the A1g stretching mode. Si2Te3 was intercalated with elemental manganese to ā¼ 1 at.%. Intercalation lowers the pressure of the proposed phase transition to 7.5 Ā± 1 GPa. Raman modes show both phonon stiffening and phonon softening, suggesting negative linear compressibility. These results provide fundamental insight into the high-pressure optical phonon behavior of silicon telluride and illuminate how a specific electron-donating intercalant can chemically alter pressure-dependent optical phonon behavior.