< Back to Optical Materials
Sodium Chloride NaCl
Sodium Chloride, common rock salt, is one of the most useful materials for general purpose spectroscopic windows and applications where sensitivity to moisture is unimportant.
Products
Windows
| Transmission Range | 0.2 to 15 μm |
| Refractive Index | 1.49065 at 10.6 μm |
| Reflection Loss | 7.5% at 10.6 μm (2 surfaces) |
| Absorption Coefficient | 7 x 10-6 cm-1 @ 10.6 μm |
| Reststrahlen Peak | 50.1 μm |
| dn/dT | -40.83 x 10-6/°C |
| dn/dμ | n/a |
| Density | 2.17 g/cc |
| Melting Point | 801°C |
| Thermal Conductivity | 6.5 W m-1 K-1 @ 273 K |
| Thermal Expansion | 44 x 10-6 K-1 |
| Hardness | Knoop 18.2 in with 200g indenter |
| Specific Heat Capacity | 854 J Kg-1 K-1 |
| Dielectric Constant | 5.9 at 1 MHz |
| Young's Modulus (E) | 39.98 GPa |
| Shear Modulus (G) | 12.61 GPa |
| Bulk Modulus (K) | 24.42 GPa |
| Elastic Coefficients | C11 = 48.5; C12 = 12.3; C44 = 12.61 |
| Apparent Elastic Limit | 3.9 MPa (560 psi) |
| Poisson Ratio | 0.252 |
| Solubility | 35.7 g/100 g water at 273°C |
| Molecular Weight | 58.45 |
| Class/Structure | Cubic FCC, NaCl, Fm3m (#221), (100) cleavage |
| μm | No | μm | No | μm | No |
|---|---|---|---|---|---|
| 0.589 | 1.54427 | 2.074 | 1.52736 | 14.6 | 1.45572 |
| 0.640 | 1.54141 | 9.00 | 1.50100 | 16.0 | 1.4399 |
| 0.760 | 1.53682 | 9.50 | 1.49980 | 17.8 | 1.41649 |
| 0.884 | 1.53395 | 10.6 | 1.49065 | 19.8 | 1.38559 |
| 0.972 | 1.53253 | 11.4 | 1.48476 | 20.57 | 1.3735 |
| 1.054 | 1.53153 | 12.5 | 1.47568 | 22.3 | 1.3403 |
| 1.555 | 1.53815 | 13.5 | 1.46660 |
Sodium Chloride is produced in large ingots by the Kyropoulos growth method. Sodium Chloride cleaves easily. With care Sodium Chloride can be polished to a high standard under humidity controlled conditions
REFERENCES:
(1) H.H.Li, Absorption Coefficients, Int.J.Therm, V1, No. I, 1980
(2) Combes, et.al.; J.Opt. Soc. Am. V41, p215, 1951
