Enter a species  (e.g. Al, Fe): Na
Enter a hexagonal lattice type (e.g. hcp): hcp
Enter a model name: Morse_Shifted_GirifalcoWeizer_1959MedCutoff_Na__MO_636041334617_003
Enter hexagonal lattice constants 'a' and 'c' (m): 3.849226932080406e-10, 6.294969307175981e-10

Calculating isothermal bulk modulus

Warning: Maximum number of function evaluations has been exceeded.

Finished calculation

C11 = 12.758560384113897 GPa
C12 = 3.0202061189761307 GPa
  B = 6.266324207355386 GPa