Phonon band structure (supercell [2, 2, 2], Δ=0.01 Å); no imaginary modes; min freq = -0.03 THz
Cell + Ionic relaxation with Orb v3; 0.03 eV/Å threshold; final energy = -62.4718 eV; energy change = -0.0507 eV; symmetry: Pm → Pm
