|
|
|
|
Sodium Fluoride (NaF) |
| Sodium Fluoride has the lowest refractive index of all common optical materials which makes it of interest as a Cerenkov radiator in Particle Physics research. Crystran Ltd. has supplied Sodium Fluoride material which has been made into large arrays at CERN and it is used in Ring Imaging Cerenkov Counters (RICH). |
|
|
Product Data |
| Transmission Range : |
0.14 to 11 μm |
| Refractive Index : |
1.3255 at 0.6 μm |
| Reflection Loss : |
3.9% at 0.6 μm |
| Absorption Coefficient : |
1 x 10-3 cm-1 at 7 μm @ 300K (1) |
| Reststrahlen Peak : |
35.8 μm |
| dn/dT : |
-13 x 10-6 /°C at 293K |
| dn/dμ = 0 : |
1.7 μm |
| Density : |
2.79 g/cc @20°C |
| Melting Point : |
980°C |
| Thermal Conductivity : |
3.746 W m-1 K-1 at 273K |
| Thermal Expansion : |
36 x 10-6 /K at 300K |
| Hardness : |
Knoop 60 in <100> |
| Specific Heat Capacity : |
1088 J Kg-1 K-1 |
| Dielectric Constant : |
6 at 1 MHz |
| Youngs Modulus (E) : |
79.01 GPa |
| Shear Modulus (G) : |
12.70 GPa |
| Bulk Modulus (K) : |
47.9 GPa |
| Elastic Coefficients : |
C11=79.01; C12=12.7; C44=47.9 |
| Apparent Elastic Limit : |
2.4 MPa (estimated) |
| Poisson Ratio : |
0.326 |
| Solubility : |
4.22g/100g water at 18°C |
| Molecular Weight : |
42.0 |
| Class/Structure : |
Cubic FCC, NaCl, Fm3m, (100) cleavage |
To download this data or our MSDS safety data sheet as a pdf, please click on the links at the top of the page. To expand the transmission graphs, please click on the image.
|
|
|
|
Refractive Index |
| µm |
No |
µm |
No |
µm |
No |
| 0.140 |
1.55 |
0.145 |
1.499 |
0.161 |
1.438 |
| 0.175 |
1.410 |
0.186 |
1.393 |
0.199 |
1.3805 |
| 0.203 |
1.3772 |
0.302 |
1.34232 |
0.405 |
1.33194 |
| 0.486 |
1.32818 |
0.546 |
1.3264 |
0.589 |
1.32549 |
| 0.707 |
1.32372 |
0.811 |
1.32272 |
0.912 |
1.32198 |
| 1.014 |
1.3215 |
2.000 |
1.3170 |
3.100 |
1.313 |
| 4.100 |
1.308 |
5.100 |
1.301 |
6.100 |
1.292 |
| 7.100 |
1.281 |
8.100 |
1.269 |
9.100 |
1.252 |
| 10.30 |
1.233 |
11.30 |
1.209 |
12.50 |
1.18 |
| 13.80 |
1.142 |
15.10 |
1.093 |
16.70 |
1.029 |
|
|
Product Notes |
Sodium Fluoride is produced by vacuum Stockbarger techniques. The Sodium Fluoride is very difficult to anneal and cleaves readily limiting the useful size of pieces to about 80mm. Sodium Fluoride polishes well but must be kept in dry air to maintain the quality of the surfaces and retain the deep UV transmission needed for Cerenkov radiation from this material.
REFERENCES:
(1) H.H.Li, Absorption Coefficients, Int.J.Therm, V1, No. I, 1980
|
|
|
Data provided is extracted from our technical handbook of materials. While every attempt has been made to verify the source of the information, Crystran Ltd accept no responsibility for accuracy of data |
|
Back to Materials
|
|
|
Membership
Crystran Ltd is proud to be ISO 9001 certified through LRQA and ISO
14001 certified through SGS. |
| |
|
