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Phonon Dispersion: SnTiO3

Name Structure Phonon-Bands Dispersion Description
Pm3m
(Cubic)
Pm-3m

 

Brillouin Zone

  1. SnTiO3 in cubic symmetry has several instabilities
  2. Ferroelectric (FE) instability at Γ (0,0,0) reciprocal point
  3. AntiFerroElectric (AFE) instabilities at X (0.5, 0.5, 0)
  4. AntiFerroDistortive (AFD) instabilities at
    M (0.5,0.5,0) and R (0.5,0.5,0.5) reciprocal points
  5. Freezing in the eigenvector at Γ (0,0,0) reciprocal
    point reduces the symmetry to P4mm
P4mm
(Tetragonal)
P4mm

Brillouin Zone

  1. SnTiO3 in tetragonal symmetry does not exhibit
    any instabilities
  2. The structure is stable at 0ºK
  3. Obtained by freezing in the Γ point eigenvectors
    of cubic (Pm3m) phase