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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) 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.

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Click to access current KRS5 Stock ATR Prisms 

µm   Noµm   Noµm   No
0.54   2.680591.00   2.446201.50   2.40774
2.00   2.394983.00   2.385744.00   2.38204
5.00   2.379796.00   2.377977.0   2.37627
8.0   2.374529.0   2.3726710.0   2.37069
11.0   2.3685412.0   2.3662213.0   2.36371
14.0   2.3610115.0   2.3581216.0   2.35502
17.0   2.3517318.0   2.3482219.0   2.34451
20.0   2.3405821.0   2.3364322.0   2.33206
23.0   2.3274624.0   2.3226425.0   2.31758
26.0   2.3122927.0   2.3067628.0   2.30098
29.0   2.2949530.0   2.2886731.0   2.28212
32.0   2.2753133.0   2.2682334.0   2.26087
35.0   2.2532236.0   2.2452837.0   2.23705
38.0   2.2285039.0   2.2196540.0   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