type: thermalexpansion

references:
  - R.H. Bogaard et al.,
    Thermochimica Acta 218:373-393, 1993,
    https://doi.org/10.1016/0040-6031(93)80437-F,
    fit to Fig. 6 (T_min=100K, T_max=1400K)

A_11: 2.068e-08
A_11,T: 1.579e-09
A_11,T^2: 3.449e-13

T_ref: 293.15