# this file is part of refractiveindex.info database
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REFERENCES: "J. N. Zemel, J. D. Jensen, and R. B. Schoolar. Electrical and optical properties of epitaxial films of PbS, PbSe, PbTe, and SnTe, <a href=\"https://doi.org/10.1103/PhysRev.140.A330\"><i>Phys. Rev.</i> <b>140</b>, A330-A342, 1965</a>"
COMMENTS: "300 K (27 °C)"
DATA:
  - type: formula 1
    range: 5.0 10
    coefficients: 0 21.1 1.37
