references:
  - Y.S. Touloukian et al.,
    TPRC Data Series Volume 1. Thermal conductivity - metallic elements and alloys,
    IFI/Plenum, 1970,
    fit to Tab. 61R (T_min=80K, T_max=500K)
  - https://www.engineeringtoolbox.com/specific-heat-metals-d_152.html

output: [T]

K_11: 7.495e+1
K_11,T: -5.646e-2
K_11,T^2: 1.420e-5
K_11,T^3: -5.390e-7
K_11,T^4: 4.012e-9

K_33: 5.204e+1
K_33,T: -3.940e-2
K_33,T^2: 7.037e-6
K_33,T^3: -3.738e-7
K_33,T^4: 2.873e-9

T_ref: 293.15

C_p: 210.0