Enter a species  (e.g. Al, Fe): Ge
Enter a hexagonal lattice type (e.g. hcp): hcp
Enter a model name: ThreeBodyBondOrder_KDS_KhorDasSarma_1988_Ge__MO_216597146527_000
Enter hexagonal lattice constants 'a' and 'c' (m): 3.423162271623768e-10, 4.52523856768036e-10

Calculating isothermal bulk modulus

Warning: Maximum number of function evaluations has been exceeded.

Finished calculation

C11 = nan GPa
C12 = nan GPa
  B = nan GPa