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