Pressure-dependent phase transition of 2D layered silicon telluride (Si2Te3) and manganese intercalated silicon telluride


Two-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 ± 0.5 GPa evidenced by the disappearance of the A1g stretching mode. Si2Te3 was intercalated with elemental manganese to ∼ 1 at.%. Intercalation lowers the pressure of the proposed phase transition to 7.5 ± 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.

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This work was supported by the Office of Naval Research (No. N00014-16-1-3161).

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Correspondence to Kristie J. Koski.

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Johnson, V.L., Anilao, A. & Koski, K.J. Pressure-dependent phase transition of 2D layered silicon telluride (Si2Te3) and manganese intercalated silicon telluride. Nano Res. 12, 2373–2377 (2019).

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  • silicon telluride
  • Si2Te3
  • high pressure
  • diamond anvil cell
  • 2D layered material