Relaxed with Orb v3; 0.03 eV/Å threshold; final energy = -19.1233 eV; energy change = 0.0000 eV; symmetry: P2/m → P2/m
Phonon band structure (supercell [2, 2, 2], Δ=0.01 Å); imaginary modes detected; min freq = -3.84 THz