Sodium Fluoride ( NaF )
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Crystal properties |
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Crystal Type |
cubic |
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Transmission Range |
< 0.15 ... 15 µm |
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Refractive Index |
1.233 @ 10.3 µm |
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Reflective Loss |
3.6 % @ 4.0 µm |
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Reststrahlen |
35.8 µm |
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Density. |
2.726 g/cm3 |
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Melting Point |
980 °C / 997 °C |
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Molecular Weight |
41.988 |
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Thermal Conductivity |
3.746 W / (m K) |
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Specific Heat |
1088 J / (kg K) @ 0 °C |
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Thermal Expansion |
36 × 10–6 / K @ 25 °C |
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Hardness (Knoop) |
60 |
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Young’s Modulus |
64.79 GPa |
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Shear Modulus |
55.14 GPa |
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Bulk Modulus |
62.03 GPa |
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Elastic Coefficient |
C11 = 90.9 / C12 = 26.4 / C44 = 12.7 GPa |
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Dielectric Constant |
6.0 @ f = 2 MHz |
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Solubility in Water |
4.22 g / 100 g @ 18 °C |
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Cleavage Planes |
(100) |
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Standard Diameter |
200 mm |
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Application |
Cherenkov-counter |
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Remarks: |
very low refractive index |
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