NaCl (Sodium Chloride)

Download NaCl (Sodium Chloride) Datasheet (PDF, 605 KB)

NaClSodium chloride (NaCl) is used in IR spectroscopy in the 0.25–16 μm wavelength range. NaCl is a hygroscopic material therefore the optical components require storage in desiccatoror in sealed package with silica gel in a warm room and the polished surfaces must be protected from the moisture by exposing to only a dry atmosphere while using. Sodium chloride can be used to temperatures up to 400°C. The material is sensitive to thermal shock.

Application:

  • IR/FTIR spectroscopy

Product types:

  • Plane-parallel windows and wedges
  • Lenses

Specifications

Tab.1. Typical specification of NaCl optical components

Specification Typical State-of-the-art
Sizes See table in the article Plane Windows and Wedged Windows Up to 100 mm
Diameter tolerance, mm +0/-0.25 RFQ
Thickness tolerance, mm ±0.25 RFQ
Thickness matching, mm RFQ
Surface quality, scr/dig 60/40 RFQ
Surface flatness, λ @ 633nm per inch* 2 RFQ
Parallelism (wedge tolerance) 5 arc min RFQ
Coating none protecting
Packaging Typak®  

Transmission Spectrum

NaCl Transmission Spectrum

The measurements were carried out on Perkin Elmer Lambda-35 spectrophotometer and on BrukerVertex-70 Fourier-spectrometer.

Tab.2. Refractive index

λ, µm n
0.35 1.58
0.37 1.57
0.46 1.56
0.51 1.55
0.68 1.54
1.25 1.53
4.50 1.52
7.30 1.51
9.50 1.50
10.60 1.49
12.00 1.48
13.10 1.47
14.20 1.46
15.10 1.45
16.00 1.44

Tab.3. Optical properties

Transmission range, microns 0.25 – 16
Colour Colourless
Reflection losses @ 11 µm (2 surfaces), % 7.5
Absorption coefficient, @ 3.8 µm, 10-4 cm-1 <0.0002
Restrahlen peak, μm 50.1
dN/dT, 10-6/C -40.83

Tab.4. Physical and mechanical properties

Class / Structure Cubic FCC, Fm3m, (100) cleavage
Density @300K, g/cm2 2.17
Molecular Weight 58.45
Melting Point, °C 801
Thermal Conductivity @273K, W/(mxK) 1.15
Thermal Expansion @273K, 10-6/C 44
Hardness, Knoop with 200g indenter in (100) 18.2
in (110) 15.2
Specific Heat Capacity, J/(kg×K) 854
Debye temperature, K 321
Dielectric Constant for 106 Hz @300K 5.9
Bandgap, eV 9.0
Young Modulus (E), GPa 39.98
Shear Modulus (G), GPa 12.61
Bulk Modulus (K), GPa 24.42
Elastic Coefficient C11 = 48.7 C12 = 12.6 C44 = 12.75
Apparent Elastic Limit, MPa 2.4
Poisson Ratio 0.252

Tab.5. Chemical stability / Solubility

in water
(at 0 оС)
35.7 g/100cm3
hygroscopic
in acids insoluble in HCl
in organic solvents:  
alcohol slightly soluble
glycerol soluble

Please pay your attention that this article is for your information only. We do not supply NaCl in ingots as well as semi-finished products. Our standard products are polished parts.

For further information on our KCl optical components please see the following: Windows for IR-spectroscopy, Packaging or fill in our request form.