摘要
Two-dimensional(2D)layered silicon telluride(SizTes)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 Atg stretching mode.SizTes 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.
