# 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: |
    Crystran Ltd.
    <a href="https://issuu.com/crystran/docs/handbook_2023_website">
    The Crystran handbook of infra-red and ultra-violet optical materials (5th edition, 2023)
    </a><br>
    See also
    <a href="https://www.crystran.com/optical-materials/barium-fluoride-baf2">
    Crystran BaF<sub>2</sub> online data sheet
    </a>
COMMENTS: |
    Barium Fluoride is grown by vacuum Stockbarger technique. Unlike CaF2, BaF2 is not found in the native state and all material must be synthesised chemically making BaF2 relatively expensive to produce. Barium Fluoride cleaves easily and is highly susceptible to thermal shock. It polishes well and can be etched (5).  The highest purity Barium Fluoride VUV material can be qualified as fast scintillator grade (6). The highest purity Barium Fluoride VUV material can be qualified as fast scintillator grade (6).<br>
    REFERENCES:<br>
    (1) Handbook Optical Constants, ed Palik, V3, ISBN 0-12-544423-0<br>
    (2) I.H.Malitson; J.Opt.Soc.Am. Vol52, p1377, 1962<br>
    (3) D.Girlich; Elastic Constants of BaF2; Phys.Rev. Vol135, p1826, 1964<br>
    (4) S.Ballard et al; J.Opt.Soc.Am. Vol42, p684, 1952<br>
    (5) US patent. Chemical polish. 4,040,896 1977<br>
    (6) M.Laval et al; Nu. Insts.Meth, V206 p169, 1983
PROPERTIES:
    density:
      - value: 4890
    thermal_dispersion:
      - type: constant
        value: -1.52e-05
    thermal_expansion:
      - temperature: 273
        value: 1.81e-05
    hardness:
      - type: Knoop
        value: 8.04e8
    melting_point:
      - value: 1641
    thermal_conductivity:
      - temperature: 286
        value: 11.72
    youngs_modulus:
      - value: 53.07e9
    poissons_ratio:
      - value: 0.343
    solubility:
      - temperature: 296
        value: 1.7
DATA:
  - type: tabulated n
    data: |
        0.1408 1.8150
        0.1452 1.7820
        0.1477 1.7670
        0.1500 1.6780
        0.2000 1.5570
        0.2652 1.5122
        0.2803 1.5066
        0.2893 1.5039
        0.2967 1.5019
        0.3021 1.5000
        0.3130 1.4978
        0.3254 1.4952
        0.3403 1.4925
        0.3466 1.4915
        0.3610 1.4894
        0.3663 1.4887
        0.4046 1.4844
        0.5461 1.4759
        0.5893 1.4744
        0.6438 1.4730
        0.6563 1.4727
        0.7065 1.4718
        0.8521 1.4699
        0.8944 1.4694
        1.0140 1.4685
        1.1287 1.4678
        1.3673 1.4667
        1.5295 1.4661
        1.6810 1.4656
        1.7012 1.4655
        1.9701 1.4647
        2.3254 1.4636
        2.6738 1.4623
        3.2434 1.4602
        3.4220 1.4594
        5.1380 1.4501
        5.5490 1.4473
        6.2380 1.4422
        6.6331 1.4390
        7.0442 1.4353
        7.2680 1.4331
        9.7240 1.4051
        10.346 1.3936
  - type: tabulated k
    data: |
        0.120 6.64E-06
        0.121 9.59E-06
        0.122 8.18E-06
        0.123 9.18E-06
        0.124 9.10E-06
        0.125 9.67E-06
        0.126 8.87E-06
        0.127 8.77E-06
        0.128 8.74E-06
        0.129 8.78E-06
        0.130 9.57E-06
        0.131 1.00E-05
        0.132 9.53E-06
        0.133 8.99E-06
        0.134 7.35E-06
        0.135 4.25E-06
        0.136 2.41E-06
        0.137 1.37E-06
        0.138 8.55E-07
        0.139 6.94E-07
        0.140 6.41E-07
        0.141 6.09E-07
        0.142 5.81E-07
        0.143 5.54E-07
        0.144 5.29E-07
        0.145 5.04E-07
        0.146 4.80E-07
        0.147 4.60E-07
        0.148 4.42E-07
        0.149 4.23E-07
        0.150 4.04E-07
        0.151 3.85E-07
        0.152 3.65E-07
        0.153 3.45E-07
        0.154 3.24E-07
        0.155 3.03E-07
        0.156 2.82E-07
        0.157 2.66E-07
        0.158 2.56E-07
        0.159 2.47E-07
        0.160 2.38E-07
        0.161 2.30E-07
        0.162 2.26E-07
        0.163 2.25E-07
        0.164 2.27E-07
        0.165 2.30E-07
        0.166 2.27E-07
        0.167 2.22E-07
        0.168 2.17E-07
        0.169 2.25E-07
        0.170 2.31E-07
        0.171 2.25E-07
        0.172 2.16E-07
        0.173 2.13E-07
        0.174 2.11E-07
        0.175 2.06E-07
        0.176 1.98E-07
        0.177 1.90E-07
        0.178 1.84E-07
        0.179 1.77E-07
        0.180 1.93E-07
        0.181 1.85E-07
        0.182 1.78E-07
        0.183 1.67E-07
        0.184 1.53E-07
        0.185 1.49E-07
        0.186 1.47E-07
        0.187 1.46E-07
        0.188 1.44E-07
        0.189 1.41E-07
        0.190 1.38E-07
        0.191 1.36E-07
        0.192 1.32E-07
        0.193 1.28E-07
        0.194 1.24E-07
        0.195 1.24E-07
        0.196 1.24E-07
        0.197 1.18E-07
        0.198 1.12E-07
        0.199 1.13E-07
        0.200 1.14E-07
        0.201 1.15E-07
        0.202 1.15E-07
        0.203 1.17E-07
        0.204 1.33E-07
        0.205 1.17E-07
        0.206 1.02E-07
        0.207 9.63E-08
        0.208 9.26E-08
        0.209 9.10E-08
        0.210 9.17E-08
        0.211 9.31E-08
        0.212 9.19E-08
        0.213 8.14E-08
        0.214 8.54E-08
        0.215 9.75E-08
        0.216 1.05E-07
        0.217 1.06E-07
        0.218 1.09E-07
        0.219 9.94E-08
        0.220 8.71E-08
        2.500 0.00E+00
        2.600 0.00E+00
        2.700 0.00E+00
        2.800 0.00E+00
        2.900 0.00E+00
        3.000 0.00E+00
        3.100 0.00E+00
        3.200 0.00E+00
        3.300 0.00E+00
        3.400 0.00E+00
        3.500 0.00E+00
        3.600 0.00E+00
        3.700 0.00E+00
        3.800 0.00E+00
        3.900 0.00E+00
        4.000 0.00E+00
        4.100 0.00E+00
        4.200 0.00E+00
        4.300 0.00E+00
        4.400 0.00E+00
        4.500 0.00E+00
        4.600 0.00E+00
        4.700 0.00E+00
        4.800 0.00E+00
        4.900 0.00E+00
        5.000 0.00E+00
        5.100 0.00E+00
        5.200 0.00E+00
        5.300 0.00E+00
        5.400 0.00E+00
        5.500 0.00E+00
        5.600 0.00E+00
        5.700 0.00E+00
        5.800 0.00E+00
        5.900 0.00E+00
        6.000 0.00E+00
        6.100 0.00E+00
        6.200 0.00E+00
        6.300 0.00E+00
        6.400 0.00E+00
        6.500 0.00E+00
        6.600 0.00E+00
        6.700 0.00E+00
        6.800 0.00E+00
        6.900 0.00E+00
        7.000 0.00E+00
        7.100 0.00E+00
        7.200 0.00E+00
        7.300 0.00E+00
        7.400 0.00E+00
        7.500 0.00E+00
        7.600 0.00E+00
        7.700 0.00E+00
        7.800 0.00E+00
        7.900 0.00E+00
        8.000 0.00E+00
        8.100 0.00E+00
        8.200 0.00E+00
        8.300 0.00E+00
        8.400 5.05E-08
        8.500 1.11E-07
        8.600 2.41E-07
        8.700 4.37E-07
        8.800 6.27E-07
        8.900 7.77E-07
        9.000 9.40E-07
        9.100 1.19E-06
        9.200 1.51E-06
        9.300 1.85E-06
        9.400 2.22E-06
        9.500 2.65E-06
        9.600 3.17E-06
        9.700 3.79E-06
        9.800 4.49E-06
        9.900 5.24E-06
        10.00 6.09E-06
        10.10 7.15E-06
        10.20 8.38E-06
        10.30 9.74E-06
        10.40 1.12E-05
        10.50 1.29E-05
        10.60 1.48E-05
        10.70 1.71E-05
        10.80 1.96E-05
        10.90 2.22E-05
        11.00 2.52E-05
        11.10 2.84E-05
        11.20 3.20E-05
        11.30 3.63E-05
        11.40 4.12E-05
        11.50 4.67E-05
        11.60 5.26E-05
        11.70 5.93E-05
        11.80 6.67E-05
        11.90 7.46E-05
        12.00 8.30E-05
        12.10 9.29E-05
        12.20 1.04E-04
        12.30 1.16E-04
        12.40 1.29E-04
        12.50 1.44E-04
        12.60 1.59E-04
        12.70 1.74E-04
        12.80 1.90E-04
        12.90 2.08E-04
        13.00 2.23E-04
        13.10 2.59E-04
        13.20 2.83E-04
        13.30 3.10E-04
        13.40 3.39E-04
        13.50 3.72E-04
        13.60 4.07E-04
        13.70 4.46E-04
        13.80 4.87E-04
        13.90 5.29E-04
        14.00 5.74E-04
        14.10 6.22E-04
        14.20 6.73E-04
        14.30 7.29E-04
        14.40 7.93E-04
        14.50 8.67E-04
        14.60 9.48E-04
        14.70 1.04E-03
        14.80 1.13E-03
        14.90 1.23E-03
        15.00 1.33E-03