Relaxed with Orb v3; 0.03 eV/Å threshold; final energy = -44.1333 eV; energy change = -0.0415 eV; symmetry: Pccm → Pccm
Phonon band structure (supercell [2, 2, 2], Δ=0.01 Å); imaginary modes detected; min freq = -1.35 THz