# this file is part of refractiveindex.info database
# refractiveindex.info database is in the public domain
# copyright and related rights waived via CC0 1.0

REFERENCES: "<a href=\"https://refractiveindex.info/download/data/2017/schott-infrared-chalcogenide-glasses-irg-25-english-us-10042017.pdf\">SCHOTT Infrared Chalcogenide Glasses - IRG 25 Product flyer (Version April 2017)</a>"
DATA:
  - type: formula 2
    wavelength_range: 0.85 12
    coefficients: 2.7574 3.0990 0.1596 1.6660 2045.5
  - type: tabulated k
    data: |
        1.0 1.6181E-06
        1.5 5.2464E-07
        2.0 6.1658E-07
        2.5 7.5005E-07
        3.0 8.5054E-07
        3.5 7.0515E-07
        4.0 6.4307E-07
        4.5 1.6113E-06
        5.0 1.7904E-06
        5.5 5.2839E-07
        6.0 4.7987E-07
        6.5 5.7213E-07
        7.0 5.0361E-07
        7.5 7.8097E-07
        8.0 2.5325E-06
        8.5 1.2975E-06
        9.0 1.5200E-06
        9.5 1.5273E-06
        10.0 1.4454E-06
        10.5 2.6312E-06
        11.0 5.6027E-06
        11.5 1.4873E-05
        12.0 4.8621E-05
        12.5 1.1618E-04
        13.0 1.2083E-04
        13.5 7.0251E-05
        14.0 4.0215E-05
        14.5 3.8226E-05
        15.0 5.4962E-05
        15.5 9.2605E-05
SPECS:
    n_absolute: false
    wavelength_vacuum: false
    temperature: 20.0 °C
    thermal_dispersion:
      - type: "Schott formula"
        coefficients: 1.80e-05 0 0 2.10e-07 0 1.67e-03
    density: 4.66 g/cm<sup>3</sup>
    thermal_expansion:
      - temperature_range: 20 100 °C
        coefficient: 14.0e-06 K<sup>-1</sup>
    specific_heat: 0.33 J/(g·K)
    thermal_conductivity:
      - value: 0.25 W/(m·K)
    transition_temperature: 285 °C
    Knoop_hardness: 1.13 GPa
    fracture_toughness: 0.438 MPa·m<sup>1/2</sup>
    Youngs_modulus: 22.1 GPa
