type: thermalexpansion

references:
  - Z. Li and R.C. Bradt,
    Journal of the American Ceramic Society 69(12):863-866, 1986,
    https://doi.org/10.1111/j.1151-2916.1986.tb07385.x

Alpha_11: 3.27e-6
Alpha_11,T: 3.25e-9
Alpha_11,T^2: -1.36e-12

Alpha_33: 3.18e-6
Alpha_33,T: 2.48e-9
Alpha_33,T^2: -8.51e-13

T_ref: 273.15