Fe2O8Sr3Tl (space group: P4/mmm #123, crystal system: tetragonal, point group: 4/mmm)
Interstitially doped with C at ~5.0%; supercell [2, 2, 2]; dopant atoms = 6
Phonon band structure (supercell [2, 2, 2], Δ=0.01 Å); imaginary modes detected; min freq = -19.87 THz
Phonon band structure (supercell [2, 2, 2], Δ=0.01 Å); imaginary modes detected; min freq = -19.87 THz
Phonon band structure (supercell [2, 2, 2], Δ=0.01 Å); imaginary modes detected; min freq = -19.87 THz