Enter a species  (e.g. Al, Fe): Si
Enter a hexagonal lattice type (e.g. hcp): hcp
Enter a model name: MFF_MistriotisFlytzanisFarantos_1989_Si__MO_080526771943_001
Enter hexagonal lattice constants 'a' and 'c' (m): 2.935510507553203e-10, 4.881973716306315e-10

Calculating isothermal bulk modulus

Optimization terminated successfully.
         Current function value: -9.074634
         Iterations: 76
         Function evaluations: 199

Finished calculation

C11 = 1278.7612302025266 GPa
C12 = 1167.5378716218618 GPa
  B = 1204.6123244820833 GPa