CALCIUM FLUORIDE, CaF2
Calcium Fluoride is used for optical windows, lenses and prisms in the 0.15 µm - 9 µm range. This material has found wide use in high power laser optics due to its low absorption. Polished surfaces are stable and will last several years under normal conditions. Due to its low refractive index, Calcium Fluoride can be used without anti-reflection coating. Maximum available size: 320 mm Dia x 60 mm Thk.
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Main Properties |
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Chemical Formula |
CaF2 |
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Crystal Class |
Cubic, cleaves [111] plane |
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Lattice Constant, Å |
5.46 |
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Density, g/cm3 (20 °C) |
3.18 |
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Molecular Weight |
78.08 |
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Dielectric Constant for 105 Hz |
6.76 |
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Melting Temperature, K |
1630 |
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Thermal Conductivity, W/(m K) at 273 K |
10 |
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Thermal Expansion, 1/K at 300 K |
18.9 x 10-6 |
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Specific Heat, cal/(g K) at 273 K |
0.204 |
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Debye Temperature, K |
510 |
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Young's Modulus, GPa |
75.79 |
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Rupture Modulus, GPa |
0.0365 |
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Shear Modulus, GPa |
33.76 |
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Bulk Modulus, GPa |
83.03 |
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Poisson's Ratio |
0.28 |
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Knoop Hardness, kg/mm2 |
178 [100], 160 [110] |
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