type: Hooke

references:
  - D.J. Dever,
    Journal of Applied Physics 43(8):3293-3301, 1972,
    https://doi.org/10.1063/1.1661710,
    fit to Tab. II (T_min=25ºC, T_max=880ºC)

C_11: 232.2e+9
C_11,T: -4.683e+7
C_11,T^2: -5.988e+4

C_12: 136.4e+9
C_12,T: -1.970e+7
C_12,T^2: 3.760e+3

C_44: 117.0e+9
C_44,T: -2.015e+7
C_44,T^2: -7.485e+2

T_ref: 293.15