Sodium Fluoride
NaF
Sodium Fluoride

Crystal properties

Crystal Type

cubic

 

Transmission Range

< 0.15 ... 15 µm

Refractive Index

1.233 @ 10.3 µm

Reflective Loss

3.6 % @ 4.0 µm

Reststrahlen

35.8 µm

Density.

2.726 g/cm3

Melting Point

980 °C / 997 °C

Molecular Weight

41.988

Thermal Conductivity

3.746 W / (m K)

Specific Heat

1088 J / (kg K) @ 0 °C

Thermal Expansion

36 × 10–6 / K @ 25 °C

Hardness (Knoop)

60

Young’s Modulus

64.79 GPa

Shear Modulus

55.14 GPa

Bulk Modulus

62.03 GPa

Elastic Coefficient

C11 = 90.9 / C12 = 26.4 / C44 = 12.7 GPa

Dielectric Constant

6.0 @ f = 2 MHz

Solubility in Water

4.22 g / 100 g @ 18 °C

Cleavage Planes

(100)

Standard Diameter

200 mm 
larger diameters on request

Application

Cherenkov-counter 
AR coating material

Remarks:

very low refractive index