Material KRS-6 (Tallium Bromide - Chloride)
KRS-6 crystals by sealed ampoule Stockbarger technique. Starting materials of the highest purity are selected to ensure that there are no anionic absorption bands between 2 and 16 microns and all crystals are checked for quality by using a path length of 120mm. Thallium salts are toxic, and KRS-6 has enough solubility to require extreme caution. Careful handling with plastic gloves covered with soft cotton gloves as appropriate to delicate optics is required. KRS-6 is used for IR windows and lenses where transmission in the 0.4 µm - 32 µm range is desired. This material is considered toxic and should be handled with care.
BASE PROPERTIES of KRS-6
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PARAMETER |
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VALUE |
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| OPTICAL |
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Transmission Range |
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0.4 to 30 microns |
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Refractive Index |
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2.1723 at 11 microns |
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Reflection Loss |
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25.4% at 11 µm (2 surfaces) |
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dN/dµ = 0 |
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5.5 microns |
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Restrahlen Peak |
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91.5 microns |
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| PHYSICAL |
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Density |
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7.18 g/cm3 |
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Melting Point |
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423° C |
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Thermal Conductivity |
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0.7 W/(m*K) at 329K |
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Thermal Expansion |
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50x 10-6/°C |
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Hardness |
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Knoop 29.9 with 500g indenter |
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Specific Heat Capacity |
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188 J kg-1K-1 |
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Dielectric Constant |
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32 at 1MHz |
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Young's Modulus (E) |
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20.68 GPa |
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Shear Modulus (G) |
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8.48 GPa |
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Bulk Modulus (K) |
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22.81 GPa |
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Elastic Coefficients |
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C11=38.5 MPa, C12=14.9
MPa,
C44=7.37 MPa |
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Apparent Elastic Limit |
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20.7 MPa (3000psi) |
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Poisson Ratio |
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0.219 |
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| CHEMICAL |
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Solubility |
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0.3g/100g water at 20°C |
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Molecular Weight |
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40 mole % TlBr: 60 mole % TlCl |
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Class/Structure |
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Cubic, CsCl structure, Pm3m, no cleavage planes |
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REFRACTIVE INDEX of KRS-6
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Wavelength, µm |
0.6 |
0.7 |
0.8 |
0.9 |
1.0 |
1.1 |
1.2 |
1.3 |
1.4 |
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|
Refractive Index |
2.329 |
2.298 |
2.266 |
2.351 |
2.240 |
2.232 |
2.223 |
2.221 |
2.376 |
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Wavelength, µm |
1.6 |
1.7 |
1.8 |
1.9 |
2.0 |
2.2 |
2.4 |
2.6 |
2.8 |
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|
Refractive Index |
2.212 |
2.210 |
2.209 |
2.207 |
2.206 |
2.204 |
2.202 |
2.201 |
2.200 |
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Wavelength, µm |
3.0 |
3.5 |
4.0 |
4.5 |
5.0 |
6.0 |
7.0 |
8.0 |
9.0 |
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|
Refractive Index |
2.199 |
2.197 |
2.196 |
2.194 |
2.193 |
2.19 |
2.187 |
2.184 |
2.181 |
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Wavelength, µm |
10 |
11 |
12 |
13 |
14 |
15 |
16 |
17 |
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Refractive Index |
2.177 |
2.172 |
2.167 |
2.162 |
2.156 |
2.150 |
2.144 |
2.138 |
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Wavelength, µm |
18 |
19 |
20 |
21 |
22 |
23 |
24 |
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Refractive Index |
2.131 |
2.124 |
2.115 |
2.107 |
2.098 |
2.087 |
2.075 |
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Delivery
Maximum available size: dia. 50 mm x 70 mm
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