type: Hooke

references:
  - E.S. Fisher and C.J. Renken,
    Physical Review 135(2A):A482-A494, 1964,
    https://doi.org/10.1103/PhysRev.135.A482,
    fit to Tab. IV (T_min=77K, T_max=923K)

C_11: 162.5e+9
C_11,T: -5.915e+7
C_11,T^2: 1.156e+4

C_12: 91.8e+9
C_12,T: 2.192e+7
C_12,T^2: -1.621e+4

C_44: 46.8e+9
C_44,T: -1.857e+7
C_44,T^2: -3.745e+3

C_33: 180.6e+9
C_33,T: -4.110e+7
C_33,T^2: 7.330e+3

C_13: 68.9e+9
C_13,T: 2.965e+6
C_13,T^2: -5.767e+3

T_ref: 293.15