# this file is part of refractiveindex.info database
# refractiveindex.info database is in the public domain
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REFERENCES: "A. S. Barker Jr. and M. Ilegems. Infrared lattice vibrations and free-electron dispersion in GaN. <a href=\"https://doi.org/10.1103/PhysRevB.7.743\"><i>Phys. Rev. B</i> <b>7</b>, 743-750 (1973)</a>"
COMMENTS: "α-GaN (wurtzite); Ordinary ray (o); 300 K (27 °C)."
DATA:
  - type: formula 1
    wavelength_range: 0.35 10
    coefficients: 2.60 1.75 0.256 4.1 17.86
