# this file is part of refractiveindex.info database
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REFERENCES: "M. Simon et al.. Refractive indices of photorefractive bismuth titanate, barium-calcium titanate, bismuth germanium oxide, and lead germanate, <a href=\"https://doi.org/10.1002/1521-396X(199702)159:2<559::AID-PSSA559>3.0.CO;2-0\"><i>Phys. Stat. Sol.</i> <b>159</b>, 559-562 (1997)</a>"
COMMENTS: "Polarization parallel to a-axis. 21 °C."
DATA:
  - type: formula 2
    range: 0.45 0.70
    coefficients: 0 5.299 0.04739
