type: Hooke
references:
  - Kamm, G. N. & Alers, G. A.
    Journal of Applied Physics, American Institute of Physics, 1964, 35, 327-330
    https://doi.org/10.1063/1.1713309
  - Gerlich, D. & Fisher, E. S.
    Journal of Physics and Chemistry of Solids, 1969, 30, 1197-1205
    https://doi.org/10.1016/0022-3697(69)90377-1
T_ref: 300
C_11: 106.1e+9
C_11, T: -359.3e+5
C_11, T^2: -152.7e+2
C_12: 578.3e+8
C_12, T: -781.6e+4
C_12, T^2: -551.3e+1
C_44: 243.1e+8
C_44, T: -142.9e+5
C_44, T^2: -404.6e+1