# this file is part of refractiveindex.info database
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REFERENCES: "S.H. Wemple, M. Didomenico Jr., and I. Camlibel. Dielectric and optical properties of melt-grown BaTiO<sub>3</sub>, <a href=\"    https://doi.org/10.1016/0022-3697(68)90164-9\"><i>J. Phys. Chem. Solids</i> <b>29</b>, 1797-1803 (1968)</a>"
COMMENTS: "Ordinary ray (o). Room temperature."
DATA:
  - type: formula 1
    range: 0.4 0.7
    coefficients: 0 4.187 0.223
