../../td/EquilibriumCrystalStructure__TD_457028483760_002/runner Ga A_oC4_63_c a b/a c/a y1 standard 1 2.7854 2.9018453 1.1948374 0.13408348 Tersoff_LAMMPS_NordAlbeErhart_2003_GaN__MO_612061685362_004