Korth Kristalle GmbH

Refractive Index


KRS-5 (



Properties (KRS-5)    
Transmission Range (50% of total transmission)   0,57 - 40 µm (thickness 5,5/ 5 mm)  
Refractive Index   2,57288 @633nm  
Reflective Loss   16,53% @10 µm  
Reststrahlen   170 µm (max. Reflection) 
Density   7,365 g/cm3  
Melting Point   414.5°C  
Molecular Weight   42% TlBr, 58% TlI 
Thermal_Conductivity   0.544 W/(m·K) @293K 
Heat Capacity   160 J/(kg·K)  
Thermal Expansion   58.0 · 10-6 /K @293...373K 
Hardness (Mohs)   40.2 <100> (Indenter load: 200g)  
Young`s Modulus   15.85 GPa  
Shear Modulus   5.79 GPa  
Bulk Modulus   19.78 GPa  
Rupture Modulus   26,2 MPa  
Elastic Coefficient   C11 = 34,1; C12 = 13,6; C44 = 5,79 GPa  
Dielectric Constant   32,5 @298K; f = 100 Hz...10 MHz 
Solubility in Water   0.05g / 100g @20°C  
Crystal Structure   TlBr: 42%, TlJ: 58%  
Crystal Type  cubic, CsCl type structure, a= 4,11 Å  
Cleavage Planes   none  
Poisson Ratio   0.34 
Application   ATR Spectroscopy is a collective term used to describe methods to analyse the radiative energy of samples by dispersing their radiative energy by wavelength. Spectroscopes are used for the visual inspection of optical spectra.  Spectrometers are recording devices and are also used for other ranges of the electro-magnetic spectrum as well as particles like electrons and ions. Samples can be irradiated resulting in different emissions which can then be analysed. The oldest spectroscopic methods (called classical spectroscopy) involve the study of light emission and absorption by molecules and atoms using grating and prism spectrometers. Molecular spectroscopy studies the interaction of molecules with electro-magnetic fields. It allows for the identification of molecular properties such as bonding length and strength and the identification of atomic fragments. Molecular spectra differ from atomic spectra by many more, often overlapping lines or bands. The reason for this is that molecules not only absorb or emit energy by electron transfers but also by vibrations of atoms against one another and molecular rotation around one of their axis. (Atenuated Total Reflection Plates), IR optics 
Remarks   Attention: Thallium salts are toxic but because of the low water-solubility only little danger when handling with spectroscopy. KRS-5 is soluble in some organic barren (Ethylenglykol, Dimethylsulfoxide, 1,2-Propandiamin), complexing agents and strong basics. Max. temperature for application: 200°C, easy deformable (cold liquidity). 

Transmission spectrum


Transmission spectrum-2



MSDS TlX 12 EN MSDS_TlX_12_EN.pdf (113.3 KiB)

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