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Material KRS-5 (Thallium Bromide-Iodide)
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KRS-5 - transparent in wide spectral range from 0.6 microns (red, visible) to 50 microns (far IR).
KRS-5 material - transparent in wide spectral range from 0.6 microns (red, visible) to 50 microns (far infrared IR). KRS-5 crystalline material is used for KRS-5 prisms, IR KRS-5 windows and KRS-5 lenses, where transmission in the range (0.6 - 40) microns is desired. KRS-5 crystallizes by the sealed-ampule Stockbarger technique. KRS-5 material has a tendency to cold-flow and changing its shape with time. KRS-5 crystals is only slightly soluble in water but can be dissolved in alcohol, nitric acid, and aqua regia.
CRYSTALTECHNO Ltd.
- grows KRS-5 Thallium Bromide-Iodide (TlBr-TlI)
ingot dimensions: dia. up to 150 mm, thickness up to 150 mm
- manufactures KRS-5 optical components (blanks, windows, wedges, lenses, ATR hemispheres, ATR prisms)
- produces granulated Thallium Iodide (TlI) and Thallium Bromide (TlBr) (purity 99,999%). Production capacity is up to 50 kg per month.
CAUTION: Thallium salts and KRS-5 are considered toxic and should be handled with care.
Perhaps you will find required KRS-5 optics at our stock, please see item Optical Crystals.
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KRS-5 (Thallium Bromide-Iodide) BASE PROPERTIES
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PARAMETER |
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VALUE |
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| OPTICAL PROPERTIES of KRS-5 |
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Transmission Range |
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(0.6 - 50) microns |
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Refractive Index
at 0,63 microns
at 10,6 microns |
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2,57
2,37 |
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Reflection Loss |
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30% at 10,6 microns (2 surfaces) |
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dn/dT |
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-235 x 10-6/degrees C |
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Restrahlen Peak |
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135 microns |
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Index of absorption ( at 10,6 microns), |
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(1-5).10-4 1/cm |
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Spectral transmittance of 3mm polished window |
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65% at 0,63 microns, 70% at (2 - 25) microns |
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| PHYSICAL PROPERTIES of KRS-5 |
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Density |
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7.371 g/cm3 |
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Melting Point |
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414.5 degrees C |
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Thermal Conductivity |
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0.544W/(m*K) at 20 degrees C |
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Thermal Expansion |
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58x 10-6/ degrees C |
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Hardness |
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Knoop 40.2 kg/mm2 |
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Specific Heat Capacity |
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200 J kg-1K-1 at 0 degrees C |
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Dielectric Constant |
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32.5 |
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Young's Modulus (E) |
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15.85 GPa |
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Shear Modulus (G) |
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5.79 GPa |
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Bulk Modulus (K) |
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9.78 GPa |
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Elastic Coefficients |
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C11=33.1 MPa, C12=13.2
MPa,
C44=5.74 MPa |
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Apparent Elastic Limit |
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26.2 MPa |
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Poisson Ratio |
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0.369 |
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| CHEMICAL PROPERTIES of KRS-5 |
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Solubility |
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0.05g/100g water at 20 degrees C |
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Molecular Weight |
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42 mole % TlBr: 58 mole % TlI |
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Class/Structure |
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Cubic, CsCl structure. No cleavage planes |
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KRS-5 (Thallium Bromide-Iodide) REFRACTIVE INDEX
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Wavelength, microns |
0.540 |
1.000 |
1.500 |
2.000 |
3.000 |
4.000 |
5.000 |
6.000 |
7.000 |
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Refractive Index |
2.681 |
2.446 |
2.408 |
2.395 |
2.386 |
2.382 |
2.380 |
2.378 |
2.376 |
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Wavelength, microns |
8.000 |
9.000 |
10.00 |
11.00 |
12.00 |
13.00 |
14.00 |
15.00 |
16.00 |
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Refractive Index |
2.375 |
2.373 |
2.371 |
2.369 |
2.366 |
2.364 |
2.361 |
2.358 |
2.355 |
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Wavelength, microns |
17.00 |
18.00 |
19.00 |
20.00 |
21.00 |
22.00 |
23.00 |
24.00 |
25.00 |
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Refractive Index |
2.352 |
2.348 |
2.345 |
2.341 |
2.336 |
2.332 |
2.327 |
2.323 |
2.318 |
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Wavelength, microns |
26.00 |
27.00 |
28.00 |
29.00 |
30.00 |
31.00 |
32.00 |
33.00 |
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Refractive Index |
2.312 |
2.307 |
2.301 |
2.295 |
2.289 |
2.282 |
2.275 |
2.268 |
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Wavelength, microns |
34.00 |
35.00 |
36.00 |
37.00 |
38.00 |
39.00 |
40.00 |
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Refractive Index |
2.261 |
2.253 |
2.245 |
2.237 |
2.228 |
2.220 |
2.210 |
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Maximum available size of KRS-5 blanks: 200 mm Dia x 60 mm Thk
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