Sodium Chloride (NaCl)

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

Sodium 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

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/cm3 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.