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KRS5 Thallium Bromo-Iodide (TlBr-TlI)

♦ KRS5 Thallium Bromo-Iodide (TlBr-TlI) Data Sheet   ♦ KRS5 Thallium Bromo-Iodide (TlBr-TlI) MSDS

KRS5 Thallium Bromo-Iodide (TlBr-TlI) FDS (French)

♦ KRS5 Thallium Bromo-Iodide (TlBr-TlI) Safe Handling

KRS5 deep IR material with a high refractive index, KRS5 is used extensively in spectroscopy for ATR prisms, windows and lenses. In conjunction with Germanium, KRS5 can also be used in athermalised IR imaging systems.

Transmission Range : 0.6 to 40 μm
Refractive Index : 2.371 at 10 μm (1)(3)
Reflection Loss : 28.4% at 10 μm (2 surfaces)
Absorption Coefficient : n/a
Reststrahlen Peak : n/a
dn/dT : -235 x 10-6 /°C
dn/dμ = 0 : 7 μm
Density ; 7.371 g/cc (3)
Melting Point : 414.5 °C (3)
Thermal Conductivity : 0.544 W m-1 K-1 at 293K
Thermal Expansion : 58 x 10-6 /°C (2)
Hardness : Knoop 40.2 (2)
Specific Heat Capacity : 200 J Kg-1 K-1 at 273K
Dielectric Constant : 32.5
Youngs Modulus (E) : 15.85 GPa (2)
Shear Modulus (G) : 5.79 GPa (2)
Bulk Modulus (K) : 19.78 GPa (2)
Elastic Coefficients : C11=331; C12=13.2; C44=5.79
Apparent Elastic Limit : 26.2 MPa (2)
Poisson Ratio : 0.369
Solubility : 0.05g/100g water at 293K
Molecular Weight : 42 mole% TlBr; 58 mole% TlI
Class/Structure : Cubic, CsCl structure, Pm3m, No cleavage (3)

To download this data or our MSDS safety data sheet as a pdf, please click on the links at the top of the page.  To expand the transmission graphs, please click on the image.

Click to access current KRS5 Stock Windows
Click to access current KRS5 Stock ATR Prisms 

µm   Noµm   Noµm   No
0.54    2.68059 1.00    2.44620 1.50    2.40774
2.00    2.39498 3.00    2.38574 4.00    2.38204
5.00    2.37979 6.00    2.37797 7.0    2.37627
8.0    2.37452 9.0    2.37267 10.0    2.37069
11.0    2.36854 12.0    2.36622 13.0    2.36371
14.0    2.36101 15.0    2.35812 16.0    2.35502
17.0    2.35173 18.0    2.34822 19.0    2.34451
20.0    2.34058 21.0    2.33643 22.0    2.33206
23.0    2.32746 24.0    2.32264 25.0    2.31758
26.0    2.31229 27.0    2.30676 28.0    2.30098
29.0    2.29495 30.0    2.28867 31.0    2.28212
32.0    2.27531 33.0    2.26823 34.0    2.26087
35.0    2.25322 36.0    2.24528 37.0    2.23705
38.0    2.22850 39.0    2.21965 40.0    2.21047

KRS-5 crystalises by the sealed-ampoule Stockbarger technique. Starting materials of the highest purity are selected to ensure that there are no anionic absorption bands between 2μm and 16μm and all crystals are checked for quality by using a pathlength of 120mm.
CAUTION: Thallium salts are considered TOXIC and should be handled with care.

REFERENCES
(1) Rodney and Malitson J.Opt Soc.Am. V46, p 956, 1953
(2) Combes, Ballard, McCarthy: J.Opt Soc.Am. V41, p 215, 1951
(3) Handbook of Optical Constants, ed Palik, V3, ISBN 0-12-544423-0