Sodium chloride
Material
NaCl
Natriumchlorid (NaCl) is a material with high transmission in the wavelength range between 0.25 µm and 16 µm and is therefore used for optical windows, lenses and prisms for the UV and IR range. Due to its low absorption, sodium chloride is mainly used in high-power laser systems.
Sodium chloride is hygroscopic and highly soluble in water. Therefore, its use requires a dry environment or a special protective layer against moisture. Sodium chloride can be used at temperatures up to over 400 °C, but is sensitive to thermal shock.
Properties
Optical and spectral properties | |
---|---|
Transmission range in µm (minimum 10%) | 0,17‐23 |
Transmission range in µm (minimum 50%) | 0,18‐20 |
Refractive index @633nm | 1,542 (1,490 @10,6µm) |
Reflection losses in % at 1 surface | 3,93 @10µm
|
Reflection losses, % for two surfaces | 7,6 @10,6µm
|
dN/dT in 1/K | -36 · 10-6
|
Physical properties | |
---|---|
Density in g/cm3 | 2,164
|
Melting point in °C | 801 |
Specific heat capacity in J/(kg · K) | 870 |
Thermal conductivity in W/(m · K) | 6,49
|
Thermal expansion in 1/K | 44 · 10-6
|
Dielectric constant | 5,9
|
Solubility in water in g/100g | 36 @25°C |
Mohs hardness | 3
|
Knoop hardness in kg/mm² | 18,2
|
Material type | single crystalline, synthetic
|
Crystal type | cubic, face-centered |
Crystal structure | cF8
|
Lattice constant in Å | a = 5,56
|
Elastic coefficient in GPa | C11 = 49,1 C12 = 12,8 C44 = 12,8 |
Young's Modulus (E) in Gpa | 39,98 |
Shear Modulus (G) in GPa | 12,61 |
Bulk Modulus (K) in GPa | 24,42 |
Rupture Modulus in MPa | 2,4
|
Apparent elastic limit in MPa | 3,9
|
Poisson's ratio | 0,26 |
Spectral properties |
---|
![]() |
sample thickness: 2 mm |
Optical Properties | |
---|---|
Transmission range in µm @10% min. | 0.17 - 23 |
Transmission range in µm @50% min. | 0.18 - 20 |
Refractive index @ 633nm | 1.54159 (1.49065 @10.6µm) |
Reflection losses in % at 1 surface | 3.93 @ 10µm |
Reflection losses in % at 2 surfaces | 7.6 @ 10.6µm |
dn/dT in 1/K | -36 · 10-6 |
Physical Properties | |
---|---|
Density in g/cm³ | 2.164 |
Melting point in °C | 801 |
Specific heat capacity in J/(kg · K) | 870 |
Thermal Conductivity in W/(m · K) | 6.49 |
Thermal Expansion in 1/K | 44 · 10-6 |
Dielectric constant | 5.9 |
Solubility in water in g/100g | 36 @ 25°C |
Mohs hardness | 3 |
Knoop hardness in kg/mm² | 18.2 (<100>) |
Material type | Single crystal, synthetic |
Crystal type | cubic face-centered |
Crystal structure | cF8 |
Lattice constant in Å | a = 5.6 |
Elastic coeficients in GPa | C11 = 49.1 C12 = 12.8 C44 = 12.8 |
Young's Modulus (E) in GPa | 39.98 |
Shear Modulus (G) in GPa | 12.61 |
Bulk Modulus (K) in GPa | 24.42 |
Rupture Modulus in MPa | 2.4 |
Apparent elastic limit in MPa | 3.9 |
Poisson ratio | 0.26 |
Spectral Properties | |
---|---|
![]() |